【讨论】贴一个小测试

luxz

marc
60k自由度，矩阵求解，迭代求解器
计算机：P4 2.2G 512M all in-core
在前面矩阵条件数比较好的时候大概是1s，最后矩阵条件数变差了是20s
如果用稀疏矩阵求解器，大概60s-100s
  
如果用abaqus，一次求解矩阵也是60s-100s，可惜没迭代求解器……
  
哈哈，这样我就可以告诉老板marc买的不冤枉哦！

lyq37

iterative solver? abaqus6.4 has it.

cafe0519

luxz wrote:
marc
60k自由度，矩阵求解，迭代求解器
计算机：P4 2.2G 512M all in-core
在前面矩阵条件数比较好的时候大概是1s，最后矩阵条件数变差了是20s
如果用稀疏矩阵求解器，大概60s-100s
  
如果用abaqus，一次求解矩阵也是60s-100s，可惜没迭代求解器……
  
哈哈，这样我就可以告诉老板marc买的不冤枉哦！

  
不知道你是如何使用ABAQUS的?哪个版本啊?

lyq37

http://www.hks.com/support/ts_v64/books/rnb/def.htm?startat=abc05aqs08.html
  
Iterative linear equation solver
  
Products: ABAQUS/Standard  ABAQUS/CAE   
  
Benefits: The iterative solver can be more efficient than the direct sparse solver for some classes of problems.
  
Description: For some very large blocky models, typically having several million degrees of freedom, the iterative solver can be faster than the direct sparse solver. The iterative solver is recommended only if the model is well conditioned; i.e., it contains relatively homogeneous material properties, well-shaped solid elements, and small amounts of contact and/or constraint equations. The iterative solver can be used with linear and nonlinear static and steady-state heat transfer procedures with symmetric stiffness matrices. The direct sparse solver is recommended in all other cases. In general, the memory use for the iterative solver will be much larger than the direct solver, although the disk storage requirements will be much smaller.