Compute Intensive case [PCG solver]???
Hi,
I am looking at nonNewtonianIcoFoam under incompresible. It invokes PCG solver to solve Ax=b kind of equation. I am interested in increasing the size of the matrix such that each iteration of matrixvector multiplication takes large amount of time to complete. Currently, I managed to increase the n_cells to ~14K by running the fineMesh utility. But the matrixvector multiplication just takes 0.1 ms per invocation. Please suggest how can I increase upon the computation inside matrixvector multiplication. Thanks!!! 
Can you elaborate on why you want PCG to take longer? At the moment you still have a relatively small system to solve, so increasing the amount of dofs can increase the time somewhat. Creating a badly conditioned system will also increase your PCG solve time, but this is probably difficult as OpenFOAM will try to avoid that for obvious reasons.

Quote:
Can you please suggest the way of increasing the amount of dofs? 
Problems with PCG?
Hey pkr,
how are you doing with your evaluation of PCGSolvers on multicoresystems? Do you compute on just 1 machine or in a network on more than one? By looking around in the forum I saw this Thread (named 'Cluster OpenFOAM [Solved]'): http://www.cfdonline.com/Forums/ope...amsolved.html Have you seen some problems with computing the pressure with PCGalgorithm on more than 1 machine, like it is said in post nr. 6? With best reagrds, CST 
All times are GMT 4. The time now is 07:30. 