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GRIDLESS METHOD FOR UNSTEADY VISCOUS FLOWS 认领 引用 被引量：3
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作者 蒲赛虎 陈红全 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2012年第1期1-8,共8页
Gridless method is developed for unsteady viscous flows involving moving boundaries. The point distri- bution of gridless method is implemented in an isotropic or anisotropic way according to the features of viscous f... Gridless method is developed for unsteady viscous flows involving moving boundaries. The point distri- bution of gridless method is implemented in an isotropic or anisotropic way according to the features of viscous flows. In the area far away from the body, the traditional cloud of isotropic points is used, while in the adjacent area, the cloud of anisotropic points is distributed. In this way, the point spacing normal to the wall can be small enough for simulating the boundary layer, and meanwhile, the total number of points in the computational do- main can be controlled due to large spacing in other tangential direction through the anisotropic way. A fast mov- ing technique of clouds of points at each time-step is presented based on the attenuation law of disturbed motion for unsteady flows involving moving boundaries. In the mentioned cloud of points, a uniform weighted least- square curve fit method is utilized to discretize the spatial derivatives of the Navier-Stokes equations. The pro- posed gridless method, coupled with a dual time-stepping method and the Spalart-Allmaras turbulence model, is implemented for the Navier-Stokes equations. The computational results of unsteady viscous flows around a NLR7301 airfoil with an oscillating flap and a pitching NACA0012 airfoil are presented in a good agreement with the available experimental data. 展开更多
关键词 gridless method cloud of points Navier-Stokes equations unsteady flow viscous flow
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HYBRID CARTESIAN GRID/GRIDLESS METHOD FOR CALCULATING VISCOUS FLOWS OVER MULTI-ELEMENT AIRFOILS 认领 引用 被引量：1
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作者 蒲赛虎 陈红全 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2013年第3期232-236,共5页
A hybrid Cartesian grid/gridless method is developed for calculating viscous flows over multi-element airfoils.The method adopts an unstructured Cartesian grid to cover most areas of the computational domain and leave... A hybrid Cartesian grid/gridless method is developed for calculating viscous flows over multi-element airfoils.The method adopts an unstructured Cartesian grid to cover most areas of the computational domain and leaves only small region adjacent to the aerodynamic bodies to be filled with the cloud of points used in the gridless methods,which results in a better combination of the computational efficiency of the Cartesian grid and the flexibility of the gridless method in handling complex geometries.The clouds of points in the local gridless region are implemented in an anisotropic way according to the features of the thin boundary layer of the viscous flows over the airfoils,and the clouds of points at the vicinity of the interface between the grid and the gridless regions are also controlled by using an adaptive refinement technique during the generation of the unstructured Cartesian grid.An implementation of the resulting hybrid method is presented for solving two-dimensional compressible Navier-Stokes(NS)equations.The simulations of the viscous flows over a RAE2822airfoil or a two-element airfoil are successfully carried out,and the obtained results agree well with the available experimental data. 展开更多
关键词 multi-element airfoil gridless method Cartesian grid viscous flow NS equations
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A Preconditioned Gridless Method for Solving Euler Equations at Low Mach Numbers 认领 引用 被引量：1
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作者 曹骋 陈红全 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2015年第4期399-407,共9页
A preconditioned gridless method is developed for solving the Euler equations at low Mach numbers.The preconditioned system in a conservation form is obtained by multiplying apreconditioning matrix of the type of Weis... A preconditioned gridless method is developed for solving the Euler equations at low Mach numbers.The preconditioned system in a conservation form is obtained by multiplying apreconditioning matrix of the type of Weiss and Smith to the time derivative of the Euler equations,which are discretized using agridless technique wherein the physical domain is distributed by clouds of points.The implementation of the preconditioned gridless method is mainly based on the frame of the traditional gridless method without preconditioning,which may fail to converge for low Mach number simulations.Therefore,the modifications corresponding to the affected terms of preconditioning are mainly addressed.The numerical results show that the preconditioned gridless method still functions for compressible transonic flow simulations and additionally,for nearly incompressible flow simulations at low Mach numbers as well.The paper ends with the nearly incompressible flow over a multi-element airfoil,which demonstrates the ability of the method presented for treating flows over complicated geometries. 展开更多
关键词 gridless method preconditioning Euler equations cloud of points
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Numerical Simulation for the External Combustion of Base-Bleed Projectile Using Gridless Method 认领 引用
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作者 Wei Wu Hou-Qian Xu +1 位作者 Liang Wang Rui Xue 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2014年第3期95-100,共6页
The gridless method coupled with finite rate chemistry model is employed to simulate the external combustion flow fields of M864 base bleed projectile. The fluid dynamics process is described by Euler Equation in 2-D ... The gridless method coupled with finite rate chemistry model is employed to simulate the external combustion flow fields of M864 base bleed projectile. The fluid dynamics process is described by Euler Equation in 2-D axisymmetric coordinate. The numerical method is based on least-square gridless method,and the inviscid flux is calculated by multi-component HLLC( Harten-Lax-van Leer-Contact) scheme,and a H2-CO reaction mechanism involving 9 species and 11 reactions is used. The computations are performed for the full projectile configuration of Ma = 1. 5,2,and 3. The hot air injection cases and inert cases are simulated for comparison. The numerical results show that due to the combustion in the weak region,the recirculation zone enlarges and moves downstream,the base pressure increases and the total drag force coefficient decreases. At Ma = 3. 0,the rear stagnation point shifts downstream approximate 0. 26 caliber,and the base pressure increases about 53. 4%,and the total drag force coefficient decreases to 0. 182 which agrees well with the trajectory model prediction. Due to neglecting the effects of viscosity and turbulence,there exists a certain difference at Ma = 1. 5,2. 0. 展开更多
关键词 gridless method finite rate reaction model base bleed projectile
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Application of Gridless Method to Simulation of Compressible Multi-Material Flows 认领 引用
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作者 Liang Wang Houqian Xu +1 位作者 Wei Wu Rui Xue 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2015年第6期103-109,共7页
The least-square gridless method was extended to simulate the compressible multi-material flows. The algorithm was accomplished to solve the Arbitrary Lagrange-Euler( ALE) formulation. The local least-square curve fit... The least-square gridless method was extended to simulate the compressible multi-material flows. The algorithm was accomplished to solve the Arbitrary Lagrange-Euler( ALE) formulation. The local least-square curve fits was adopted to approximate the spatial derivatives of a point on the base of the points in its circular support domain,and the basis function was linear. The HLLC( Harten-Lax-van Leer-Contact) scheme was used to calculate the inviscid flux. On the material interfaces,the gridless points were endued with a dual definition corresponding to different materials. The moving velocity of the interface points was updated by solving the Riemann problem. The interface boundary condition was built by using the Ghost Fluid Method( GFM).Computations were performed for several one and two dimensional typical examples. The numerical results show that the interface and the shock wave are well captured,which proves the effectiveness of gridless method in dealing with multi-material flow problems. 展开更多
关键词 multi-material flow interface tracking gridless method ALE formulation
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Gridless Solution Method for Two-Dimensional Unsteady Flow 认领 引用 被引量：5
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作者 王刚 孙迎丹 叶正寅 《Chinese Journal of Aeronautics》 EI CAS 2005年第1期8-14,共7页
The main purpose of this paper is to develop a gridless method for unsteady flow simulation. A quadrantal point infilling strategy is developed to generate point and combine clouds of points automatically. A point-mov... The main purpose of this paper is to develop a gridless method for unsteady flow simulation. A quadrantal point infilling strategy is developed to generate point and combine clouds of points automatically. A point-moving algorithm is introduced to ensure the clouds of points following the movements of bodyboundaries. A dual time method for solving the two-dimenslonal Euler equations in Arbitrary Lagrangian-Eulerian （ALE） formulation is presented. Dual time method allows the real-time step to be chosen on the basis of accuracy rather than stability. It also permits the acceleration techniques, which are commonly used to speed up steady flow calculations, to be used when marching the equations in pseudo time. The spatial derivatives, which are used to estimating the inviscid flux, are directly approximated by using local least-squares curve method. An explicit multistage Runge-Kutta algorithm is used to advance the flow equations in pseudo time. In order to accelerate the solution to convergence, local time stepping technique and residual averaging are employed. The results of NACA0012 airfoil in transonic steady flow are presented to verify the accuracy of the present spatial discretization method. Finally, two AGARD standard test cases in which NACA0012 airfoil and NACA64A010 airfoil oscillate in transonic flow are simulated. The computational results are compared with the experimental data to demonstrate the validity and practicality of the presented method. 展开更多
关键词 computational fluid dynamics gridless method dual time method unsteady flow Euler equation
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Preconditioned gridless methods for solving three-dimensional Euler equations at low Mach numbers 认领 引用
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作者 Cheng Cao Hongquan Chen Jiale Zhang 《International Journal of Modeling, Simulation, and Scientific Computing》 EI 2020年第6期108-128,共21页
In this paper,preconditioned gridless methods are developed for solving the threedimensional(3D)Euler equations at low Mach numbers.The preconditioned system is obtained by multiplying a preconditioning matrix of the ... In this paper,preconditioned gridless methods are developed for solving the threedimensional(3D)Euler equations at low Mach numbers.The preconditioned system is obtained by multiplying a preconditioning matrix of the type of Weiss and Smith to the time derivative of the 3D Euler equations,which are discretized under the clouds of points distributed in the computational domain by using a gridless technique.The implementations of the preconditioned gridless methods are mainly based on the frame of the traditional gridless method without preconditioning,which may fail to have convergence for flow simulations at low Mach numbers,therefore the modifications corresponding to the affected terms of preconditioning are mainly addressed in the paper.An explicit four-stage Runge–Kutta scheme is first applied for time integration,and the lower-upper symmetric Gauss-Seidel(LU-SGS)algorithm is then introduced to form the implicit counterpart to have the further speed up of the convergence.Both the resulting explicit and implicit preconditioned gridless methods are validated by simulating flows over two academic bodies like sphere or hemispherical headform,and transonic and nearly incompressible flows over one aerodynamic ONERA M6 wing.The gridless clouds of both regular and irregular points are used in the simulations,which demonstrates the ability of the method presented for coping with flows over complicated aerodynamic geometries.Numerical results of surface pressure distributions agree well with available experimental data or simulated solutions in the literature.The numerical results also show that the preconditioned gridless methods presented still functions for compressible transonic flow simulations and additionally,for nearly incompressible flow simulations at low Mach numbers as well.The convergence of the implicit preconditioned gridless method,as expected,is much faster than its explicit counterpart. 展开更多
关键词 Gridless method preconditioning Euler equations LU-SGS algorithm cloud of points
A Gridless-Finite Volume Hybrid Algorithm for Euler Equations 认领 引用 被引量：5
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作者 马志华 陈红全 吴晓军 《Chinese Journal of Aeronautics》 EI CAS 2006年第4期286-294,共9页
A fast hybrid algorithm based on gridless method coupled with finite volume method （FVM） is developed for the solution to Euler equations. Compared with pure gridless method, the efficiency of the hybrid algorithm i... A fast hybrid algorithm based on gridless method coupled with finite volume method （FVM） is developed for the solution to Euler equations. Compared with pure gridless method, the efficiency of the hybrid algorithm is improved to the level of finite volume method for most parts of the flow filed arc covered with grid cells. Moreover, the hybrid method is flexible to deal with the configurations as clouds of points are used to cover the region adjacent to the bodies. Mirror satellites and mirror grid cells arc introduced to the interface to accomplish data communication between the different parts of the flow field. The Euler Equations arc spatially discretized with finite volume method and gridless method in mesh and clouds of points respectively, and an explicit four-stage Runge-Kutta scheme is utilized to reach the steady-state solution. Internal flows in channels and external flows over airfoils arc investigated with hybrid method, and the solutions arc comparad to those using pure finite volume method and pure gridless method. Numerical examples show that the hybrid algorithm captures the shock waves accurately, and it is as efficient as fmite volume method. 展开更多
关键词 fluid mechanicsl hybrid algorithm： gridless method finite volume method Euler equations
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Euler solution using adaptive Cartesian grid with a gridless boundary treatment 认领 引用
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作者 Liang Xiang Guowei Yang 《Acta Mechanica Sinica》 SCIE EI CAS 2009年第2期187-196,共10页
A quadtree-based adaptive Cartesian grid generator and flow solver were developed.The grid adaptation based on pressure or density gradient was performed and a gridless method based on the least-square fashion was use... A quadtree-based adaptive Cartesian grid generator and flow solver were developed.The grid adaptation based on pressure or density gradient was performed and a gridless method based on the least-square fashion was used to treat the wall surface boundary condition,which is generally difficult to be handled for the common Cartesian grid.First,to validate the technique of grid adaptation,the benchmarks over a forward-facing step and double Mach reflection were computed.Second,the flows over the NACA 0012 airfoil and a two-element airfoil were calculated to validate the developed gridless method.The computational results indi-cate the developed method is reasonable for complex flows. 展开更多
关键词 Cartesian grid Gridless method Adaptation technique Euler solution
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动边界问题无网格算法及其动态点云 认领 引用 被引量：8
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作者 王红 陈红全 +1 位作者 马志华 蒲赛虎 《南京航空航天大学学报（自然科学版）》 EI CAS 北大核心 2009年第3期296-301,共6页
提出基于Delaunay图映射的点云运动处理技术。该技术使点云随物体运动再生成问题变成简单的映射关系,无需迭代,且能保持点云结构不变,故有效地避免了因点云结构变动而产生的附加计算量。运用该技术,结合非定常Euler方程双时间步无网格算... 提出基于Delaunay图映射的点云运动处理技术。该技术使点云随物体运动再生成问题变成简单的映射关系,无需迭代,且能保持点云结构不变,故有效地避免了因点云结构变动而产生的附加计算量。运用该技术,结合非定常Euler方程双时间步无网格算法,成功地模拟了翼型的跨声速非定常流动。其中物理时间迭代采用二阶隐式格式,伪时间迭代采用四步龙格-库塔显式格式。文中给出了不同翼型的计算结果,并与实验结果进行了比较,取得了令人满意的结果。 展开更多
关键词 动边界 非定常流动 无网格方法 双时间步长 Delaunay图映射
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含化学反应膛口流场的无网格数值模拟 认领 引用 被引量：7
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作者 吴伟 许厚谦 +1 位作者 王亮 薛锐 《爆炸与冲击》 EI CAS CSCD 北大核心 2015年第5期625-632,共8页
基于无网格方法,对包含大位移运动边界和非平衡化学反应的膛口流场进行了数值模拟。所发展算法是基于线性基函数最小二乘显式无网格方法,忽略黏性及湍流的影响,对流场采用ALE(arbitrary Lagrangian-Eulerian)形式的Euler方程描述,对流... 基于无网格方法,对包含大位移运动边界和非平衡化学反应的膛口流场进行了数值模拟。所发展算法是基于线性基函数最小二乘显式无网格方法,忽略黏性及湍流的影响,对流场采用ALE(arbitrary Lagrangian-Eulerian)形式的Euler方程描述,对流通量和化学反应源项采用多组分HLLC(Harten-Lax-van Leer-Contact)格式和有限速率反应模型计算,对于运动边界造成的点云畸形采用局部点云重构方法处理,重构过程中采用虚拟边阵面推进。对圆柱绕流和激波诱导燃烧流场进行了数值模拟,验证了重构方法和化学反应计算的有效性。最后对12.7mm口径机枪膛口流场进行了模拟,结果同实验照片、非结构网格方法结果吻合较好,数值结果清晰地再现了膛口初始冲击波、膛口冲击波、欠膨胀射流波系结构的动力学发展过程,以及膛口焰的时间、空间分布特征。 展开更多
关键词 爆炸力学 动态点云 无网格方法 膛口流场 非平衡反应流
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页岩气藏两相流固耦合无网格数值模拟 认领 引用 被引量：4
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作者 吴建发 朱维耀 +2 位作者 张德良 陈震 吴天鹏 《特种油气藏》 CAS CSCD 北大核心 2023年第4期96-103,共8页
针对页岩气藏受两相复杂流动与流固耦合作用影响导致产能预测难度大的问题,将渗流场分为主改造区、次改造区和未改造区,结合多流态统一输运模型及等效连续非均匀介质物理模型,建立多尺度气-水两相流动流固耦合数学模型,并利用无网格广... 针对页岩气藏受两相复杂流动与流固耦合作用影响导致产能预测难度大的问题,将渗流场分为主改造区、次改造区和未改造区,结合多流态统一输运模型及等效连续非均匀介质物理模型,建立多尺度气-水两相流动流固耦合数学模型,并利用无网格广义有限差分法对数学模型进行编程求解。研究结果表明:无网格广义有限差分法能适应不同计算域情况,避免传统差分网格与非结构网格耦合所导致的运算不稳定;压降前缘在未改造区的传播仅为20 m左右,固体位移主要发生在次改造区与未改造区的交界区域;忽略应力场的影响,气井投产初期产气量被显著高估,到生产后期这种影响逐渐下降;低初始含水饱和度的页岩气藏更有益于开发,储层优选时应重点考虑含水饱和度。研究成果对流固耦合数值模拟及非常规油气藏产能预测具有指导意义。 展开更多
关键词 页岩气藏 无网格法 数值模拟 多尺度渗流 流固耦合
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超声速弹丸诱导爆轰波的无网格数值模拟 认领 引用 被引量：3
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作者 吴伟 许厚谦 +2 位作者 王亮 薛锐 蔡峰峰 《推进技术》 EI CAS CSCD 北大核心 2015年第5期664-670,共7页
为研究锥角对超声速弹丸诱导爆轰波形态的影响,发展了耦合有限速率化学反应模型的最小二乘显式无网格算法,其流体动力学采用含化学反应源项的多组分Euler方程建模,对流项和时间项分别采用多组分HLLC（Harten-Lax-van Leer-Contact）格... 为研究锥角对超声速弹丸诱导爆轰波形态的影响,发展了耦合有限速率化学反应模型的最小二乘显式无网格算法,其流体动力学采用含化学反应源项的多组分Euler方程建模,对流项和时间项分别采用多组分HLLC（Harten-Lax-van Leer-Contact）格式和四阶Runge-Kutta法计算。对尖劈诱导斜爆轰以及激波诱导燃烧流场进行了模拟,验证了算法的有效性。最后对等当量比甲烷/空气预混气体中,不同锥角弹丸诱导爆轰波流场进行了模拟,云图同实验阴影照片吻合较好,结果表明当锥角处于70°~100°时,易形成驻定斜爆轰波;锥角较小不利于可燃混合气体的点燃,仅能形成驻定斜激波;过大的锥角将导致爆轰波的脱体。 展开更多
关键词 无网格方 HLLC格式 有限速率反应模型 爆轰波
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基于无网格方法的膛口二次焰数值研究 认领 引用 被引量：2
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作者 吴伟 许厚谦 +1 位作者 王亮 薛锐 《兵工学报》 EI CAS CSCD 北大核心 2014年第12期1991-1997,共7页
基于最小二乘无网格方法,对包含高速运动弹丸的膛口二次焰流场进行了数值研究。流场采用含化学反应源项的任意拉格朗日-欧拉方程描述,对流项和反应源项采用多组分HLLC格式和有限速率反应模型计算,对于弹丸运动造成的点云畸形采用局部重... 基于最小二乘无网格方法,对包含高速运动弹丸的膛口二次焰流场进行了数值研究。流场采用含化学反应源项的任意拉格朗日-欧拉方程描述,对流项和反应源项采用多组分HLLC格式和有限速率反应模型计算,对于弹丸运动造成的点云畸形采用局部重构方法处理。对发射药中不添加/添加消焰剂以及不同膛口压力条件下的全流场进行数值计算。计算阴影图与实验照片吻合较好,并且计算结果表明:添加2%钾盐消焰剂或降低膛口压力30%可有效抑制膛口二次焰。 展开更多
关键词 兵器科学与技术 无网格方法 非平衡反应流 动态点云 膛口流场
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非线性问题的MPS无网格算法 认领 引用 被引量：5
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作者 郭隽 陶智 《北京航空航天大学学报》 EI CAS 北大核心 2003年第1期83-86,共4页
给出了修正的MPS(MovingParticleSemi implicit)无网格方法 ,指出恰当选取权函数可避免使用虚节点来处理边界 ,从而解决复杂边界处虚节点难设定的问题 .以非线性Burgers方程为算例分析了其数值特性 ,结果表明 :以样条函数为权函数时不... 给出了修正的MPS(MovingParticleSemi implicit)无网格方法 ,指出恰当选取权函数可避免使用虚节点来处理边界 ,从而解决复杂边界处虚节点难设定的问题 .以非线性Burgers方程为算例分析了其数值特性 ,结果表明 :以样条函数为权函数时不采用虚节点的结果与使用虚节点的结果一致 ;对一维问题 ,光滑权函数性能明显优于非光滑权函数 ;而对二维问题 ,近边界处加权域不对称性的影响则不很显著 .与精确解或由传统方法所得结果的对比分析表明该方案可行 .该方法物理概念清晰 。 展开更多
关键词 数值模拟 非线性方程 加权 无网格方法 MPS方法
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化学反应流模拟的并行无网格方法 认领 引用 被引量：1
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作者 吴伟 许厚谦 +1 位作者 王亮 薛锐 《弹道学报》 CSCD 北大核心 2014年第2期106-110,共5页
为进一步扩大无网格方法在复杂化学反应流场模拟中的计算规模，基于 MPI（Message Passing Interface）并行环境，发展了耦合有限速率反应模型的并行无网格算法，其流体动力学采用包含反应源项的二维轴对称 Euler方程建模，对流通量采... 为进一步扩大无网格方法在复杂化学反应流场模拟中的计算规模，基于 MPI（Message Passing Interface）并行环境，发展了耦合有限速率反应模型的并行无网格算法，其流体动力学采用包含反应源项的二维轴对称 Euler方程建模，对流通量采用多组分 HLLC（Harten-Lax-van Leer-contact）格式计算，时间项运用4阶 Runge-Kutta 法显式推进。分别采用2~8个进程对激波诱导燃烧流场以及高速运动弹丸诱导斜爆轰流场进行了数值模拟，其结果同实验以及网格方法获得的结果吻合较好，并且具有较理想的并行效率，验证了其在复杂化学反应流大规模计算中应用的正确性和有效性。 展开更多
关键词 无网格方法 化学反应流 并行计算 数值模拟
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多段翼型无网格算法及其布点技术 认领 引用 被引量：3
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作者 江兴贤 陈红全 《南京理工大学学报》 EI CAS 北大核心 2005年第1期22-25,共4页
用显式无网格算法实现了多段翼型的数值模拟。与传统的网格算法不同,求解区域用“点云”离散代替通常的网格划分。基于当地点云离散结构,用二次极小曲面逼近计算空间导数。在研究该算法的基础上,给出了Euler方程无网格离散形式,运用Rung... 用显式无网格算法实现了多段翼型的数值模拟。与传统的网格算法不同,求解区域用“点云”离散代替通常的网格划分。基于当地点云离散结构,用二次极小曲面逼近计算空间导数。在研究该算法的基础上,给出了Euler方程无网格离散形式,运用Runge Kutta显式时间推进格式推进求解。此外,还描述了一种区域离散布点方法,研究了点云生成的选点准则,并成功地数值模拟了复杂多段翼型的绕流。 展开更多
关键词 无网格算法 Euler方程 点云 多段翼型
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人工黏性增强三维移动粒子半隐算法稳定性 认领 引用 被引量：2
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作者 冯美艳 黄生洪 《力学学报》 EI CAS CSCD 北大核心 2013年第4期515-524,共10页
通过综合比较移动粒子半隐方法(moving-particle semi-implicit method,MPS)各种稳定性计算方法,考虑了多种可能导致计算不稳定的因素,并首次提出加入人工黏性来抑制非物理压力振荡,得到了较为稳定的三维MPS算法.采用各种稳定性方案对... 通过综合比较移动粒子半隐方法(moving-particle semi-implicit method,MPS)各种稳定性计算方法,考虑了多种可能导致计算不稳定的因素,并首次提出加入人工黏性来抑制非物理压力振荡,得到了较为稳定的三维MPS算法.采用各种稳定性方案对比模拟了三维立方流体旋转状态下的变形及三维静水压问题,并进一步与商业软件的流体体积函数方法(volume of fluid,VOF)模型计算结果对比,验证了其正确性.结果表明:对三维情形,单纯应用已有的稳定性算法仍难以满足MPS计算稳定性的要求,而进一步辅以该文提出的人工黏性方法则可以在准确性及稳定性方面均取得较好的效果,且计算结果显示,通过该文提出的开关模式增加人工黏性并不影响压强泊松方程的求解精度,因而不会对流场的求解产生负面作用. 展开更多
关键词 移动粒子半隐方法 三维 稳定性 人工黏性 无网格方法
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处理动边界问题的无网格/直角网格混合算法 认领 引用 被引量：1
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作者 蒲赛虎 陈红全 《南京航空航天大学学报（自然科学版）》 EI CAS 北大核心 2010年第4期477-482,共6页
把无网格/直角网格混合算法发展用于涉及动边界的非定常流动计算问题。采用无网格/直角网格混合算法,计算区域整体采用直角网格,只在物面附近嵌入局部无网格。对于动边界问题,本文让主体直角网格保持固定,用原混合算法中的局部无网格区... 把无网格/直角网格混合算法发展用于涉及动边界的非定常流动计算问题。采用无网格/直角网格混合算法,计算区域整体采用直角网格,只在物面附近嵌入局部无网格。对于动边界问题,本文让主体直角网格保持固定,用原混合算法中的局部无网格区跟随运动边界,使得动边界物面附近有不变的点云结构,避免了点云重构;无网格区与直角网格交界面随边界运动跟踪确定,由于主体基于直角网格,方便了交界面的跟踪。用发展的混合算法,结合非定常Euler方程双时间推进方法,先对翼型作俯仰振荡的非定常跨声速流动进行了数值模拟,计算结果与现有文献和实验数据进行了比较与验证;结合刚体运动方程,成功模拟了二维外挂物投放过程,算例展示出发展的混合算法适合处理大位移运动边界问题。 展开更多
关键词 非定常流动 无网格法 直角网格 动边界 混合算法
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基于Riemann解的二维流体力学Lagrange有限点无网格方法 认领 引用 被引量：6
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作者 沈智军 沈隆钧 +2 位作者 吕桂霞 陈文 袁光伟 《计算物理》 EI 北大核心 2005年第5期377-385,共9页
在高维流体力学计算中,对于多介质大变形等一类问题,采用有网格方法常遇到较大的困难.针对二维问题,研究了一种无网格方法———Lagrange有限点方法:在求解区域上设置适当的离散点集,视其中每一点为流体力学Lagrange点;对于点集的任一点... 在高维流体力学计算中,对于多介质大变形等一类问题,采用有网格方法常遇到较大的困难.针对二维问题,研究了一种无网格方法———Lagrange有限点方法:在求解区域上设置适当的离散点集,视其中每一点为流体力学Lagrange点;对于点集的任一点,确定邻点集合,并基于该点同邻点集合的联系,应用Godunov方法将流体力学Lagrange方程进行离散;考虑到算法的稳健性,方法中可设置较多邻点并采用最小二乘法.将该方法应用于典型的数值算例,取得了良好效果. 展开更多
关键词 二维流体力学 Lagrange有限点方法 Riemann解 无网格
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