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[Other] matlab_FEM_dismesh DL : 1: DistMesh giving a singular FEM matrix?-Hi Anyone here with some experience of using DistMesh in finite element code? I m solving the scalar Helmoltz equation in an annular region in 2D: rho_1 < rho < rho_2 where rho_1 is the radius of a Perfect Electric Conducting cylinder and rho_2 is where the mesh is truncated using an Absorbing Boundary condition. Now, I ve written code to mesh the region myself (by dividing the region into annular rings and picking a fixed number of points on each ring) and I ve written another program which uses DistMesh to mesh the region. I get a nice solution using my own meshing code but the FEM matrix becomes singular when I use DistMesh. This is the DistMesh Code I used: Circle with hole rABC=1.5 rCyl=0.5 fdstring=sprintf( ddiff(dcircle(p,0,0, f),dcircle(p,0,0, f)) ,rABC,rCyl) fd=inline(fdstring, p ) box=[-2,-2 2,2] [p,N]=distmesh2d(fd,@huniform,0.04,box,[]) I tried changing box and the 0.04 value (initial edge length). But every time, the matrix becomes sin
Date : 2025-12-16 Size : 37kb User : skypigr
[Other] FEP2 DL : 0: FEP2程序是一个具有通用性的教学程序，可用于计算一般的线性静力学问题。目前它已设计了平面梁单元与平面3-9个节点的两种单元，但留下接口，可以接入所设计的其他类型的单元。该程序可以处理多种工况、多种类型单元组合结构问题。同时，还可以处理固定约束和指定位移的情况。其主控程序的功能主要有以下几点：（1）内存分配；（2）网格生成；（3）变带宽存储设置；（4）单刚的形成与组集；（5）刚度矩阵的分解；（6）形成节点载荷；（7）形成与组集单元载荷；（8）求解位移；（9）求单元应力；（10）求解结构反力。在FEP2中，每种单元模块都有其相对独立性，自成体系，读者可以自行接入任何一个其他的单元类型。总体来看，该教学程序目的明确，思路清晰，各个模块之间具有独立性且留有接口，非常适合初学者进行学习。-FEP2 program is a universal teaching program, can be used to calculate the general linear statics problem. At present, it has been designed both units 3-9 nodes unit and the plane of plane beam, but leave the interface, and can access the design of other types of unit. The program can handle a variety of conditions, many types of modular structures problem. At the same time, can also handle fixed constraints and the specified displacement. The function of the master program are the following: (1) memory allocation (2) mesh generation (3) Variable bandwidth storage settings (4) single-gang formation and group set (5) stiffness matrix decomposition (6) to form a node load (7) formed the group set unit load (8) to solve the displacement (9) Find the unit stress (10) to solve the structure of the reaction force. In FEP2, each unit module has its relative independence, self-contained, can tap into any other cell type. Overall, the teaching program clarity of purpose, clear thinking
Date : 2025-12-16 Size : 10kb User : juege