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Solution Control: is my equation need a symmetry, assymetric or diagonal solver? |
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October 19, 2015, 12:56 |
Solution Control: is my equation need a symmetry, assymetric or diagonal solver?
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#1 |
Member
Matt
Join Date: Oct 2012
Posts: 39
Rep Power: 13 |
I am trying to use the correct solvers within fvSolution. However, I could use some help determining whether asymmetric, symmetric, or diagonal solvers should be used.
Here is the solver equation: Code:
fvVectorMatrix UEqn ( fvm::ddt(U) + fvm::div(phi, U) - fvm::laplacian(nu, U) == flowDirection*gradP ); solve(UEqn == -fvc::grad(p)); Also, under what conditions would you already know the lower diagonal, upper diagonal, or both? From my basic education in CFD, I have only known solution matrices where the diagonals are the only known elements. |
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October 20, 2015, 05:14 |
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#2 |
Senior Member
Nima Samkhaniani
Join Date: Sep 2009
Location: Tehran, Iran
Posts: 1,266
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i guess it is asymmetric matrix, however use easy method !!! try and error.
you can assign asymmetric matrix for example PBICG if it does not work, change it
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October 21, 2015, 22:04 |
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#3 |
Member
Matt
Join Date: Oct 2012
Posts: 39
Rep Power: 13 |
LOL! Yea, I read in the online documentation that it would let you know if it was wrong. I was hoping to get a little more insight into the matter though
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