|July 9, 2012, 09:46||
Adding equations to existing solvers
Join Date: Mar 2012
Location: Munich, Germany
Posts: 67Rep Power: 7
I want to add some equations to existing solvers, at the moment to rhoCentralFoam. The difficulties in this task is the dependency of factors from the calculated values in rhoCentralFoam.
I like to add this equation:
A, B matrices (4x4), L a vector (which should be calculated).
A * dL/dx + B * dL/dy = 0.
and the coefficents from A and B consists of
a11 = func(rhoE,rhoU.components(0),rhoU.components(1)).
a12 = func(rhoE,rhoU.components(0),rhoU.components(1)).
and so on, the same for B.
In Code it looks like
... calculations rhoCentralFoam ...
// definition factors
<problem1> a11 = pow(rhoU.component(0),2) + pow(rhoU.component(1),2);
<problem1> a12 = rhoE;
and so on.
// building matrices
// solving equation
To my problems:
the matrix coefficents are scalars, but which datatyp is the best one? I thought of volScalarField, because for example rhoE and the components of rhoU are volScalarField, too. I have to deal with the components of rhoU, because I couldnīt find a vectorial notation.
How can I intialise the matrix? Taking the tensor-class seems not to be an option, because Iīve a 4x4 matrix and gives an error: "attempted to assign to a const reference to constant object" while performing the program.
The last point is the equation. If to find a implementation for the partial derive of L to x and multiplicate this with a matrix. The same for y. For this step I havenīt tried very much things, because Iīve problems building my matrix. But one thing is, for solving in need fvc::ddt(L). This means Iīve to be careful with the dimensions.
Perhaps anybody can help me with some of my problems and my description is not to confusing . Maybe there is another, and better one, entrance to this problem. Iīm open for every suggestion.
Last edited by treima; July 10, 2012 at 02:23.
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