To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-P...To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-PIM combining mass conservation algorithm,called Sharp-ISPIM-Mass,is proposed in this work.Based on the so called sharp-interface method,the technique of quadratic local velocity reconstruction has been developed by combining with the mass conservation algorithm,which enables the present method improve the accuracy of the velocity field and satisfy the mass conservation condition near the boundary field.So the proposed method would not encounter the problem of spurious mass flux.In addition,a new form of FSI force evaluation considering pressure and viscous force to perform a whole function from the fluid domain to fictitious fluid domain is introduced,which makes the present method obtain more accurate results of FSI force than the original one.Through the numerical studies of a number of benchmark examples,the performance of the Sharp-ISPIM-Mass has been examined and illustrated.展开更多
The ghost fluid method(GFM)provides a simple way to simulate the interaction of immiscible materials.Especially,the modified GFM(MGFM)and its variants,based on the solutions of multi-material Riemann problems,are capa...The ghost fluid method(GFM)provides a simple way to simulate the interaction of immiscible materials.Especially,the modified GFM(MGFM)and its variants,based on the solutions of multi-material Riemann problems,are capable of faithfully taking into account the effects of nonlinear wave interaction and material property near the interface.Reasonable treatments for ghost fluid states or interface conditions have been shown to be crucial when applied to various interfacial phenomena involving large discontinuity and strong nonlinearity.These methods,therefore,have great potential in engineering applications.In this paper,we review the development of such methods.The methodologies of representative GFM-based algorithms for definition of interface conditions are illustrated and compared to each other.The research progresses in design principle and accuracy analysis are briefly described.Some steps and techniques for multi-dimensional extension are also summarized.In addition,we present some progresses in more challenging scientific problems,including a variety of fluid/solid-fluid/solid interactions with complex physical properties.Of course the challenges faced by researchers in this field are also discussed.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51639003,51809035)This work was supported by the High-technology ship research project of Ministry of Industry and Information Technology of China(Grant No.2017-614)+3 种基金the Joint Found for Equipment Pre Research and China Shipbuilding Industry Corporation(Grant No.614B042802-28)the Fundamental Research Funds for the Central Universities(Grant No.DUT2017TB05),the China Postdoctoral Science Foundation(Grant No.2018M641693)the Liaoning Revitalization Talents Program(Grant No.XLYC1908027)the Science Foundation of Hunan Province(Grant No.2019JJ50790)and the computation support of the Supercomputing Center of Dalian University of Technology.
文摘To solve the problem of inaccurate boundary identification and to eliminate the spurious pressure oscillation in the previously developed immersed smoothed point interpolation method(IS-PIM),a new sharp-interface IS-PIM combining mass conservation algorithm,called Sharp-ISPIM-Mass,is proposed in this work.Based on the so called sharp-interface method,the technique of quadratic local velocity reconstruction has been developed by combining with the mass conservation algorithm,which enables the present method improve the accuracy of the velocity field and satisfy the mass conservation condition near the boundary field.So the proposed method would not encounter the problem of spurious mass flux.In addition,a new form of FSI force evaluation considering pressure and viscous force to perform a whole function from the fluid domain to fictitious fluid domain is introduced,which makes the present method obtain more accurate results of FSI force than the original one.Through the numerical studies of a number of benchmark examples,the performance of the Sharp-ISPIM-Mass has been examined and illustrated.
基金supported under the National Natural Science Foundation of China(Nos.11872351 and U1730118)Science Challenge Project(No.JCKY2016212A502).
文摘The ghost fluid method(GFM)provides a simple way to simulate the interaction of immiscible materials.Especially,the modified GFM(MGFM)and its variants,based on the solutions of multi-material Riemann problems,are capable of faithfully taking into account the effects of nonlinear wave interaction and material property near the interface.Reasonable treatments for ghost fluid states or interface conditions have been shown to be crucial when applied to various interfacial phenomena involving large discontinuity and strong nonlinearity.These methods,therefore,have great potential in engineering applications.In this paper,we review the development of such methods.The methodologies of representative GFM-based algorithms for definition of interface conditions are illustrated and compared to each other.The research progresses in design principle and accuracy analysis are briefly described.Some steps and techniques for multi-dimensional extension are also summarized.In addition,we present some progresses in more challenging scientific problems,including a variety of fluid/solid-fluid/solid interactions with complex physical properties.Of course the challenges faced by researchers in this field are also discussed.
