Momentum source coefficient and convergence
Hi
I'm applying momentum source coefficients over a sub domain which are dependent on velocity. Without a momentum source coefficient I was not getting convergence. I've found that a momentum source coefficient of 100000 allows the model to converge, and the results are accurate. I did this based on what the manual says: General Momentum Source Momentum sources can be specified directly in terms of a momentum value per unit volume in a specified direction. To obtain good convergence when the source is a function of velocity, the source should be linearized by including a Momentum Source Coefficient. However I don't understand why this works  can anyone explain? Or suggest a reference? Why does the momentum source coefficient improve convergence? Thanks, Matt 
This required by the specific solver technology of CFX. I guess it is describbed in the manual how to linearize. If not you have to ask the service.

This is a complex question. I will have to refer you to CFD text books like "Introduction to Computational FLuid Dynamics" by Versteeg and Malalasekera.

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