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An extended iterative direct-forcing immersed boundary method in thermo-fluid problems with Dirichlet or Neumann boundary conditions

引用

Journal of Central South University 2017年第1期24卷 137-154页

作者： Ali Akbar Hosseinjani Ali Ashrafizadeh Faculty of Mechanical Engineering K.N.Toosi University of TechnologyP.O.B.19395-1999 TehranIran

An iterative direct-forcing immersed boundary method is extended and used to solve convection heat transfer *** pressure,momentum source,and heat source at immersed boundary points are calculated simultaneously to achieve the best *** of convection heat transfer problems with both Dirichlet and Neumann boundary conditions are *** approaches for the implementation of Neumann boundary condition,*** and indirect methods,are introduced and compared in terms of accuracy and computational *** test cases include forced convection on a heated cylinder in an unbounded flow field and mixed convection around a circular body in a lid-driven ***,the proposed method is applied to study the mixed convection around a heated rotating cylinder in a square enclosure with both iso-heat flux and iso-thermal boundary *** results show that the order of accuracy of the indirect method is less than the direct ***,the indirect method takes less computational time both in terms of the implementation of the boundary condition and the post processing time required to compute the heat transfer variables such as the Nusselt *** is concluded that the iterative direct-forcing immersed boundary method is a powerful technique for the solution of convection heat transfer problems with stationary/moving boundaries and various boundary conditions.

关键词： immersed boundary method direct forcing thermo-fluid problems neumann boundary condition

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发展压力修正法计算流体与颗粒交互作用问题(英文)

发展压力修正法计算流体与颗粒交互作用问题(英文)

引用

2009年度海峡两岸工程力学研讨会

作者：林三益陳翼正国立成功大学航空太空系

A direct-forcing pressure correction method is developed to simulate fluid-particle interaction *** method applies an implicit pressure correction method to solve the incompressible flow field and the immersed boundary method which applies a direct forcing method to capture the particle *** applying the direct forcing method,the pressure correction method can eliminate the needs for the determination of free parameters,such as the stiffness coefficient in the elastic forcing method,and for the approximation of the delta *** direct forcing method can be seen as a splitting projection operator which directly projects the fluid velocity obtained from the pressure correction method to capture the particle *** direct forcing method directly computes the artificial forcing at flow elements which eliminates the transformation between flow element and particle *** makes the new method simpler and more *** sedimentations of one and two sphere particles are simulated to validate the numerical *** a demonstration of the efficient and capabilities of the new method,sedimentation of a large number of sphere particles in an enclosure is simulated.

关键词： immersed boundary method pressure correction method fluid-particle interaction direct forcing splitting projection operator sedimentation

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