develop a solver

AmirBaqa1987 · August 22, 2013, 05:29

Hi Dear all

I want to develop a solver by adding new equations to simplefoam solver, the new equations contain the following term:

$K[D \triangledown F.\triangledown T + (C/T)\triangledown T.\triangledown T]$

K,D and C are constant.

I don't know how should I write this term (Inner product of two gradients) at newSimpleFoam.C .

any help is appreciated.

Thanks in advanced.
Arjang

Bernhard · August 22, 2013, 05:43

Do you want to solve for F or for T?

If you want to solve for T, is there any physics behind this equation? Did you think about the algorithm you want to use: e.g. which terms to treat implicitly and which terms to use explicitly? It looks a bit odd to me though.

chegdan · August 22, 2013, 15:56

What is T and What is F?
Are they scalars, vectors, tensors, etc?
How have you tried to write the equation already?
Did what you have already written compile or not?

AmirBaqa1987 · August 24, 2013, 01:56

[QUOTE=Bernhard;447392]Do you want to solve for F or for T?

I want to add two Eqs. to simpleFoam solver.
one of them is energy Eq. and contains that so-called term and other one is particle continuity Eq.

with these two Eqs. I want to solve for both T and F.

August 22, 2013, 05:29	develop a solver	#1
AmirBaqa1987 Member Arjang Behnoud Join Date: Oct 2012 Posts: 61 Rep Power: 13	Hi Dear all I want to develop a solver by adding new equations to simplefoam solver, the new equations contain the following term: $K[D \triangledown F.\triangledown T + (C/T)\triangledown T.\triangledown T]$ K,D and C are constant. I don't know how should I write this term (Inner product of two gradients) at newSimpleFoam.C . any help is appreciated. Thanks in advanced. Arjang

August 22, 2013, 15:56		#3
chegdan Senior Member Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 621 Rep Power: 0	What is T and What is F? Are they scalars, vectors, tensors, etc? How have you tried to write the equation already? Did what you have already written compile or not?

August 24, 2013, 01:56	develop a solver	#4
AmirBaqa1987 Member Arjang Behnoud Join Date: Oct 2012 Posts: 61 Rep Power: 13	[QUOTE=Bernhard;447392]Do you want to solve for F or for T? I want to add two Eqs. to simpleFoam solver. one of them is energy Eq. and contains that so-called term and other one is particle continuity Eq. with these two Eqs. I want to solve for both T and F.

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August 22, 2013, 05:43		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	Do you want to solve for F or for T? If you want to solve for T, is there any physics behind this equation? Did you think about the algorithm you want to use: e.g. which terms to treat implicitly and which terms to use explicitly? It looks a bit odd to me though.