simulation whitout a U equation
 

hi,

i write my own DES model and try next to simulate the correlation of the isotropic turbulence. But in this case I got some problems with the initial conditions.
At the moment I got the velocity conditions, the problem is how it is possible to write the other fields for my fixed velocity field , in my case p,k,epsilon?

the simple idea, solve the case without U equation till convergence and i got the matching field for my velocity field?

original oodles something like this
:
fvVectorMatrix UEqn //the velocity equation
(
fvm::ddt(U)
+ fvm::div(phi, U)
+ sgsModel->divDevBeff(U)
);

if (momentumPredictor)
{ solve(UEqn == -fvc::grad(p)); }

// --- PISO loop
for (int corr=0; corr<nCorr; corr++)
{
volScalarField rUA = 1.0/UEqn.A();

U = rUA*UEqn.H();
phi = (fvc::interpolate(U) & mesh.Sf())
+ fvc::ddtPhiCorr(rUA, U, phi); ..........................

My question now how can edit the solver to solve my problem

target: p , k , epsilon for my over the time fixed velocity field?

best regard
Sven

Hi Sven

have you solved your problem already?
In order not to solve for U, you could try to increase the tolerance on U such that U is never updated in the iteration process.

I am also interesseted in how you have generated isotropic turbulence in OF? The reason why I am asking is because I want to calibrate a hybrid RANS/LES method using isotropic turbulence. Unfortunately, I was not very successful in generating isotropic turbulence until now. Do you have any tips?

Markus