Hi, I want to modify the ex
I want to modify the existing k - epsilon model in OpenFoam.
My first question would be has anyone of experience with something like that?
Basically I need to add a line that is computed in every iteration. The main problem is, that I can't find the proper files.
I can do almost everything in kEpsilon.H/.C but a few things. For example: Is there an array where all the k_ and epsilon_ values are stored ? I have a formula in which I need to apply the current k_ (iteration) and a k0_ (timestep) to calculate a new variable.
Maybe someone can give me a lead where I could look for that or how I could create such an array. Especially where I can find the loops for timesteps and iterations. (I want to use turbFoam)
I would appreciate your help - this is my first bigger modification in OpenFoam and I feel a bit lost in all those files.
Daniel, - new turbulence mo
- new turbulence model: Have a look here http://openfoamwiki.net/index.php/Si...ry_/_Tutorials
- arrays: k_ and epsilon_ are volScalarField and contain the arrays you are looking for.
Info << k_[cellI] << endl;
Prints the value of k in cell cellI.
- Loops: Have a look at the source of turbFoam and you will surely find them.
Hi, thanks a lot especially
thanks a lot especially for the link - I have one small questions - how can I access the k_ value of a previous timestep/iteration? Because in your example I get the current k_ or not?
or is there a easy explanation how a volScalarField is structured I couldn't find a proper description.
Try: k_.oldTime() You ge
You get the complete field for the old time. Also, things like
k.oldTime().oldTime().oldTime() (as many as you like!)
will work fine. Beware: this kind of game costs memory http://www.cfd-online.com/OpenFOAM_D...part/happy.gif
thanks that is perfect So n
thanks that is perfect
So now that I can access all the fields data I have another question:
I need to Implement an equation like this:
C1_new = C1_*(1+Ct_*k_/epsilon_*1/(Q+k_)*abs(d(Q+k_)/dt) )
with Q = 0.5(u^2 + v^2) (for 2D)
and Ct_ will become a Constant
So here is the thing how can I implement Q ? I am not sure how to call the components from U_
I wonder what would be the best solution for the part in the abs(), because I would have done (Q_+k_)-(Q_old+k_.oldTime())/deltaT
maybe someone can give me a hint
Hi, I think I figured it o
I think I figured it out but one small issue:
I have now the following for my
The problem is in front of the 0.38 there should be a vector full of ones the same size like k_ and epsilon_ but I don't know how to create it.
Basically I want to make:
Has someone an idea?
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