Pub Date : 2002-12-01DOI: 10.2534/JJASNAOE1968.2002.591
Gang Liu, Y. Fujimoto, E. Shintaku, S. Wakabayashi, Takuya Masaguchi, Nobuyasu Komatsubara
In this paper a method to measure stress distribution using PVDF film and electrostatic voltmeter of non-contact type is developed. PVDF film is well suited to strain sensing applications for its excellent sensitivity and other good properties. The stress and strain distributions are determined from the measured potentials taking into account the piezoelectric constitutive law of film materials. First, in this paper the relationship between the electric potential and stresses is deduced in detail. Then, parameters used in the electric potential-stress relationship are estimated by an experiment applying the PVDF films to a smooth plate specimen. Next, a method to make isotropic piezoelectric material and a method too amplify the electric potential of the PVDF film by laminating two or more PVDF films together are also introduced and validated by experiment. Last, in order to check the accuracy of PVDF film as a stress measurement sensor, an experiment to measure the stress distribution of a plate specimen with an inclined crack is performed. The experimental results are in good agreement with those obtained from numerical calculation.
{"title":"Application of PVDF Film to Stress Measurement of Structural Member","authors":"Gang Liu, Y. Fujimoto, E. Shintaku, S. Wakabayashi, Takuya Masaguchi, Nobuyasu Komatsubara","doi":"10.2534/JJASNAOE1968.2002.591","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2002.591","url":null,"abstract":"In this paper a method to measure stress distribution using PVDF film and electrostatic voltmeter of non-contact type is developed. PVDF film is well suited to strain sensing applications for its excellent sensitivity and other good properties. The stress and strain distributions are determined from the measured potentials taking into account the piezoelectric constitutive law of film materials. First, in this paper the relationship between the electric potential and stresses is deduced in detail. Then, parameters used in the electric potential-stress relationship are estimated by an experiment applying the PVDF films to a smooth plate specimen. Next, a method to make isotropic piezoelectric material and a method too amplify the electric potential of the PVDF film by laminating two or more PVDF films together are also introduced and validated by experiment. Last, in order to check the accuracy of PVDF film as a stress measurement sensor, an experiment to measure the stress distribution of a plate specimen with an inclined crack is performed. The experimental results are in good agreement with those obtained from numerical calculation.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"41 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132790943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-12-01DOI: 10.2534/JJASNAOE1968.2002.427
N. Fukuchi, Jun Takao, T. Shinoda, Changhong Hu
Many fire accidents in engine rooms of ships and marine structures come into existence in the world, and the unexpected burning of hydrocarbon liquid, such as fuel oil and lubrication oil, tends to be a good half of those primary cause. For the preventive design of oil burning fire in engine rooms, it is necessary to be grasped entirely the oil pool fires phenomena by an analysis taking thoroughly account of the governing factors and the characteristics of flammability liquid fireIn order to investigate the distinctive factors of fire spread and extinguishing by some numerical simulations of fire accident in an engine room, the basic experiments on oil burning are executed in the condition of (1)oxygen rich atmosphere, and (2)oxygen lean atmosphere. Furthermore, the oil burning phenomena in enclosed-compartment is estimated qualitatively using a simplified mathematical model with a principle feature of enclosure fire. From the results of these experiments, it can be clarified as for threshold conditions of fire spreading, thermal properties and states of oil pool fires.
{"title":"The Characteristic Analysis of Oil Pool Fires Phenomena for Fire Safety Design in Engine Room (Part 1) An Experimental Study on Thermal Properties and States during Oil Burning","authors":"N. Fukuchi, Jun Takao, T. Shinoda, Changhong Hu","doi":"10.2534/JJASNAOE1968.2002.427","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2002.427","url":null,"abstract":"Many fire accidents in engine rooms of ships and marine structures come into existence in the world, and the unexpected burning of hydrocarbon liquid, such as fuel oil and lubrication oil, tends to be a good half of those primary cause. For the preventive design of oil burning fire in engine rooms, it is necessary to be grasped entirely the oil pool fires phenomena by an analysis taking thoroughly account of the governing factors and the characteristics of flammability liquid fireIn order to investigate the distinctive factors of fire spread and extinguishing by some numerical simulations of fire accident in an engine room, the basic experiments on oil burning are executed in the condition of (1)oxygen rich atmosphere, and (2)oxygen lean atmosphere. Furthermore, the oil burning phenomena in enclosed-compartment is estimated qualitatively using a simplified mathematical model with a principle feature of enclosure fire. From the results of these experiments, it can be clarified as for threshold conditions of fire spreading, thermal properties and states of oil pool fires.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"75 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126894386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-06-01DOI: 10.2534/JJASNAOE1968.2002.191_149
T. Hirayama, Yong-Ho Choi, Y. Hirakawa
The standard ocean wave spectrum is important for short-term prediction and long-term prediction of ships or floating structures in waves. The standard wave spectra used until today are basically based on P-M (Pierson-Moskowitz) type spectrum, that has ω-5 shape in high frequency or equilibrium range.Recently, with the observed data, it has been suggested that the shape of spectrum is ω-4 instead of ω-5 shape at high frequency range. Technical committee of ITTC recommended to investigate the effect of this type of spectrum on ship responses.In this work, after introducing ω-4 type spectrum, the resultant investigations are reported for the differences in short-term and long-term predictions of vertical bending moment and vertical acceleration of a typical ship.
{"title":"Introduction of ω-4 Type Wave Spectrum and the Brief Consideration of Its Effects on the Long-Term Predictions","authors":"T. Hirayama, Yong-Ho Choi, Y. Hirakawa","doi":"10.2534/JJASNAOE1968.2002.191_149","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2002.191_149","url":null,"abstract":"The standard ocean wave spectrum is important for short-term prediction and long-term prediction of ships or floating structures in waves. The standard wave spectra used until today are basically based on P-M (Pierson-Moskowitz) type spectrum, that has ω-5 shape in high frequency or equilibrium range.Recently, with the observed data, it has been suggested that the shape of spectrum is ω-4 instead of ω-5 shape at high frequency range. Technical committee of ITTC recommended to investigate the effect of this type of spectrum on ship responses.In this work, after introducing ω-4 type spectrum, the resultant investigations are reported for the differences in short-term and long-term predictions of vertical bending moment and vertical acceleration of a typical ship.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121531730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-06-01DOI: 10.2534/JJASNAOE1968.2002.9
Zuogang Chen, Y. Doi
Unsteady viscous flow field around a fish-like advancing NACA wing is numerically studied. The main objective is to study the abilities of a flexible fish-like body to produce thrust, achieve higher propulsive efficiency as well as to catch the basic flow characteristics in viscous flow field. The Reynolds numbers based on the oncoming velocity and the body length range from 10 6 to 3x10 6 . The flow is simulated by solving two-dimensional unsteady Reynolds averaged Navier-Stokes equation in a primitive value formulation, while the turbulence transportation is described by updated algebraic eddy-viscosity model and transitional zone is computed by empirical formula. The numerical scheme is based on the MAC method with a body fitted coordinate system. The simulation shows that the high propulsive efficiency of fish-like locomotion comes from relaminarization and effective vorticity control. Relaminarization reduces the frictional force at higher Reynolds number. Fish-like locomotion can recapture energy contained in the eddies by skillfully controlling vorticity generation, travel and shed through the body undulation.
{"title":"Numerical Study on Relaminarization in Fish-Like Locomotion","authors":"Zuogang Chen, Y. Doi","doi":"10.2534/JJASNAOE1968.2002.9","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2002.9","url":null,"abstract":"Unsteady viscous flow field around a fish-like advancing NACA wing is numerically studied. The main objective is to study the abilities of a flexible fish-like body to produce thrust, achieve higher propulsive efficiency as well as to catch the basic flow characteristics in viscous flow field. The Reynolds numbers based on the oncoming velocity and the body length range from 10 6 to 3x10 6 . The flow is simulated by solving two-dimensional unsteady Reynolds averaged Navier-Stokes equation in a primitive value formulation, while the turbulence transportation is described by updated algebraic eddy-viscosity model and transitional zone is computed by empirical formula. The numerical scheme is based on the MAC method with a body fitted coordinate system. The simulation shows that the high propulsive efficiency of fish-like locomotion comes from relaminarization and effective vorticity control. Relaminarization reduces the frictional force at higher Reynolds number. Fish-like locomotion can recapture energy contained in the eddies by skillfully controlling vorticity generation, travel and shed through the body undulation.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132975467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-06-01DOI: 10.2534/JJASNAOE1968.2002.221
N. Toki
In the last two papers, the author proposed a new decision process of design values related to wave-induced responses. The process is composed of the two stages, namely, the selection of most severe sailing conditions and the estimation of short-term responses including non-linear effects in the selected conditions. The author considers that the preparation studies were finished by the last two papers.The present paper demonstrates the effectiveness of the new process taking the large container ship for which full-scale measurements were carried out in the North Pacific Ocean in winter, as a practical example. In view of bending strength and deck wetness from the bow, most severe sailing conditions are selected and non-linear simulations are carried out around them. The results seem to be reasonable, when compared with the results of the full-scale measurements and the previous study on non-linear responses of a ship with large bow flare.
{"title":"A Study on the Decision Process of Design Values related to Wave-induced Responses","authors":"N. Toki","doi":"10.2534/JJASNAOE1968.2002.221","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2002.221","url":null,"abstract":"In the last two papers, the author proposed a new decision process of design values related to wave-induced responses. The process is composed of the two stages, namely, the selection of most severe sailing conditions and the estimation of short-term responses including non-linear effects in the selected conditions. The author considers that the preparation studies were finished by the last two papers.The present paper demonstrates the effectiveness of the new process taking the large container ship for which full-scale measurements were carried out in the North Pacific Ocean in winter, as a practical example. In view of bending strength and deck wetness from the bow, most severe sailing conditions are selected and non-linear simulations are carried out around them. The results seem to be reasonable, when compared with the results of the full-scale measurements and the previous study on non-linear responses of a ship with large bow flare.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115737679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-03-10DOI: 10.2534/JJASNAOE1968.2002.191_299
M. Arai, Liang-Yee Cheng, A. Kumano, T. Miyamoto
One of the critical points in the numerical assessment of liquid sloshing is accurate and stable descriptions of the hydrodynamic impact pressures. Due to discrete approximations adopted by the available numerical methods, unnatural violently-oscillating time histories of the impulsive pressure, caused by unstable or even non-converging numerical computation, are generally obtained. The aim of this paper is to investigate the unstable nature of the impulsive pressure computation. Also, a new numerical treatment of the boundary condition for accurate and stable assessment of the sloshing impact pressure based on rectangular grid system is proposed. The comparisons of the computed results with the experimental ones confirmed the accuracy of the proposed technique. The improvements achieved over the existing approaches are also shown herein.
{"title":"A Technique for Stable Numerical Computation of Hydrodynamic Impact Pressure in Sloshing Simulation","authors":"M. Arai, Liang-Yee Cheng, A. Kumano, T. Miyamoto","doi":"10.2534/JJASNAOE1968.2002.191_299","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2002.191_299","url":null,"abstract":"One of the critical points in the numerical assessment of liquid sloshing is accurate and stable descriptions of the hydrodynamic impact pressures. Due to discrete approximations adopted by the available numerical methods, unnatural violently-oscillating time histories of the impulsive pressure, caused by unstable or even non-converging numerical computation, are generally obtained. The aim of this paper is to investigate the unstable nature of the impulsive pressure computation. Also, a new numerical treatment of the boundary condition for accurate and stable assessment of the sloshing impact pressure based on rectangular grid system is proposed. The comparisons of the computed results with the experimental ones confirmed the accuracy of the proposed technique. The improvements achieved over the existing approaches are also shown herein.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115004354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-12-01DOI: 10.2534/JJASNAOE1968.2001.190_381
M. Bessho, H. Maeda, K. Masuda, H. Takamura
The purposes of present study are to develop the powerful numerical method for sea shock phenomenon and to clarify the characteristics of sea shock responses on very large floating structure.The present numerical method has been considered the characteristics of propagation earthquake waves in water and seabed. Numerical computations have been carried out very large floating structures in the cases of several seabed conditions.From the comparisons of computational results, it is that the numerical results by present method are greatly different of the results with the rigid seabed condition.
{"title":"Study on prediction method of sea-shock response of floating structure considering the characteristics of propagation of earthquake waves in water and seabed (First Report)","authors":"M. Bessho, H. Maeda, K. Masuda, H. Takamura","doi":"10.2534/JJASNAOE1968.2001.190_381","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2001.190_381","url":null,"abstract":"The purposes of present study are to develop the powerful numerical method for sea shock phenomenon and to clarify the characteristics of sea shock responses on very large floating structure.The present numerical method has been considered the characteristics of propagation earthquake waves in water and seabed. Numerical computations have been carried out very large floating structures in the cases of several seabed conditions.From the comparisons of computational results, it is that the numerical results by present method are greatly different of the results with the rigid seabed condition.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133380203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-12-01DOI: 10.2534/JJASNAOE1968.2001.190_489
J. Sawamura, Y. Tomita, N. Osawa, K. Hashimoto, N. Shinkai
In order to analyze heat flow in the impinging combustion flame which is generated during line heating process, a 3-dimensional computer program has been developed.Reduced reaction mechanism model and Mixing combustion model are employed in this program.It is found that the calculated gas temperature distribution in the flame is in agreement with the experimental one except the peak temperature of center part of the flame when Mixing combustion model is employed.
{"title":"Study on Combustion Analysis in the Impinging Jet Flame during Line Heating Process","authors":"J. Sawamura, Y. Tomita, N. Osawa, K. Hashimoto, N. Shinkai","doi":"10.2534/JJASNAOE1968.2001.190_489","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2001.190_489","url":null,"abstract":"In order to analyze heat flow in the impinging combustion flame which is generated during line heating process, a 3-dimensional computer program has been developed.Reduced reaction mechanism model and Mixing combustion model are employed in this program.It is found that the calculated gas temperature distribution in the flame is in agreement with the experimental one except the peak temperature of center part of the flame when Mixing combustion model is employed.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123260355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-12-01DOI: 10.2534/JJASNAOE1968.2001.190_61
Ryo Yakushiji, H. Yamaguchi, T. Kawamura, M. Maeda, Motoyuki Sakota
The mechanism of cloud cavitation generation from a sheet cavity on a foil section has been studied by several researchers. It has been revealed that re-entrant jet cuts the leading edge of sheet cavity and breaks the clear vapour structure into small bubble clusters as cloud cavity. However, the detailed picture of the sheet cavity cut-off phenomenon is still missing. In this study, we carried out experimental observations of sheet-cloud cavity on a NACA0015 foil section using high speed video and hot wires mounted on a foil surface in order to clarify quantitative characteristics of re-entrant jet and its role in sheet cavity cut-off phenomenon.The results of experiments have shown that there were several patterns in the sheet cavity cut-off phenomenon, and that the thickness of re-entrant jet is an important factor.We have also carried out numerical simulations for the same test case. The numerical simulation was performed using a commercial CFD code STAR-CD and the Bubble Two Phase Flow cavitation model implemented in the code. The simulation reproduced unsteady shedding of cloud cavity, although some differences were found in the detailed features of the flow.
{"title":"Investigation for Unsteady Cavitation and Re-entrant Jet on a Foil Section","authors":"Ryo Yakushiji, H. Yamaguchi, T. Kawamura, M. Maeda, Motoyuki Sakota","doi":"10.2534/JJASNAOE1968.2001.190_61","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2001.190_61","url":null,"abstract":"The mechanism of cloud cavitation generation from a sheet cavity on a foil section has been studied by several researchers. It has been revealed that re-entrant jet cuts the leading edge of sheet cavity and breaks the clear vapour structure into small bubble clusters as cloud cavity. However, the detailed picture of the sheet cavity cut-off phenomenon is still missing. In this study, we carried out experimental observations of sheet-cloud cavity on a NACA0015 foil section using high speed video and hot wires mounted on a foil surface in order to clarify quantitative characteristics of re-entrant jet and its role in sheet cavity cut-off phenomenon.The results of experiments have shown that there were several patterns in the sheet cavity cut-off phenomenon, and that the thickness of re-entrant jet is an important factor.We have also carried out numerical simulations for the same test case. The numerical simulation was performed using a commercial CFD code STAR-CD and the Bubble Two Phase Flow cavitation model implemented in the code. The simulation reproduced unsteady shedding of cloud cavity, although some differences were found in the detailed features of the flow.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121845355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-12-01DOI: 10.2534/JJASNAOE1968.2001.190_41
S. Shirayama, Kojiro Saito, H. Yamato, H. Masuda, Hideyuki Ando
CFD simulations have been utilized to improve a hull form. As a result, a huge amount of numerical data has been acquired. In the verification process of numerical results, comparison among data obtained from different kinds of resources (e.g. experiments, other numerical experiments) plays an important role. Remarking the comparison process among data, it is found that the most difficult issue is the difference of locations that the data is defined. In this paper, we try to solve this problem. First, drawbacks of image data for the comparison in a wide spatial region are clarified. In order to overcome the drawbacks, a concept of the comparison space is introduced. Second, how to construct the comparison space is described. Finally, several numerical experiments are demonstrated to validate our concept. In the case of the linear advection problem, a new characteristic feature of the numerical error is found. In additions, it is shown that the grid dependency on the numerical results can be found out in the wide spatial region.
{"title":"A Study of Data Comparison for Steady and Unsteady CFD simulations Using a Comparison Space","authors":"S. Shirayama, Kojiro Saito, H. Yamato, H. Masuda, Hideyuki Ando","doi":"10.2534/JJASNAOE1968.2001.190_41","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.2001.190_41","url":null,"abstract":"CFD simulations have been utilized to improve a hull form. As a result, a huge amount of numerical data has been acquired. In the verification process of numerical results, comparison among data obtained from different kinds of resources (e.g. experiments, other numerical experiments) plays an important role. Remarking the comparison process among data, it is found that the most difficult issue is the difference of locations that the data is defined. In this paper, we try to solve this problem. First, drawbacks of image data for the comparison in a wide spatial region are clarified. In order to overcome the drawbacks, a concept of the comparison space is introduced. Second, how to construct the comparison space is described. Finally, several numerical experiments are demonstrated to validate our concept. In the case of the linear advection problem, a new characteristic feature of the numerical error is found. In additions, it is shown that the grid dependency on the numerical results can be found out in the wide spatial region.","PeriodicalId":321056,"journal":{"name":"Journal of the Society of Naval Architects of Japan","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116746797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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