I´ve made a simple simulation of flow through a sheet (2D) with navier-stokes equation and porous resistivity in material and the results are very accurate. However this happens when the mesh is coarse, when I make smaller elements convergence becomes more difficult and results are bad.
Can someone explain why?
Convergence vs finite element density
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Re: Convergence vs finite element density
Hi
Hard to say with this info:
Is this transient or steady state?
Are you talking about convergence of linear or nonlinear system?
-Peter
Hard to say with this info:
Is this transient or steady state?
Are you talking about convergence of linear or nonlinear system?
-Peter
Re: Convergence vs finite element density
Hi Peter
Thanks for your reply and sorry for the low info, I thought it was a general question not so hard to answer. It is steady state with convergence of nonlinear system. My previous thought was that a denser mesh was hard to compute but easier for convergence, but now I realize that it's not that simple. In fact I can resolve with more rigid boundaries and lots of iterations, but wanted to understand why is more difficult and what density must use.
Thanks again
- Jon
Thanks for your reply and sorry for the low info, I thought it was a general question not so hard to answer. It is steady state with convergence of nonlinear system. My previous thought was that a denser mesh was hard to compute but easier for convergence, but now I realize that it's not that simple. In fact I can resolve with more rigid boundaries and lots of iterations, but wanted to understand why is more difficult and what density must use.
Thanks again
- Jon