CFD Online Discussion Forums - DEFINE_SR_RATE: Override only specific reactions

Hello again everybody!

I'm here with another problem. I have several surface reactions (finite-rates) defined in my mixture. Now I want to add 2 reactions to this "mechanism" but with a more complex kinetic rate equation. So I thought I could do this by adding both reactions to the finite_rates with dummy values and then override them by using the UDF Macro DEFINE_SR_RATE. But this seems to be a problem as this macro somehow overwrites every reaction a little bit. Even when I compile an empty UDF (see below) and hook it, there seems to be a change in the reactions and my simulation does not deliver the same results with the UDF unhooked. My thought would've been that, only the *rr I override in the UDF are actually overwritten, so an empty UDF would just use the default values used in finite-rates.

Code:

DEFINE_SR_RATE(test_srrate, f, fthread, r, mw, yi, rr)

{



}

Can somebody explain me this behaviour? And if there is any possbility tell me how I can overwrite the rate of one specific reaction in finite-rates.

Thank you!