Hi, I want to know if you implement something in Fluent like a new eqution using UDS. 1)How are you checking whether you implemented something is correct or not obviously to check the results for the simple cases. But I do not want to do this. is there any other method for it. 2)Lets say if I implement same equation using UDS. Let us say use k-epsilon turbulnce model now you want to implement a new model of your own. What I would do first is to implement k-epsilon model using UDS and run some simulations by switching off the k-epsilon equation in Fluent but switching on the UDS equations and it will be a good test to check whether UDS gives you good results or not.

Any suggestions or did somebody did something like this

1) You check the code and try to use it on simple known cases. No other solutions.

2) If you want to implement an alternative k-eps model, you have two choices:

a) Add the lacking terms to the existing model in FLUENT as source terms, if possible.

b) Re-write the model completely using UDS. In this case, you have to set the case up, as if you'd use the k-eps model of FLUENT, then disable the turbulence equations of FLUENT in the Control-> Solution panel.

Pay attention to a thing: you have to implement both the k and epsilon equation, but you also have to redefine the turbulent viscosity using the proper DEFINE macro and hooking this to FLUENT in the Model->Viscous panel.

Best regards, ap