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Defining a source term

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Old   September 28, 2012, 08:00
Default Defining a source term
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Im trying to create an UDF which define an ultrasonic source term in the momentum equation, and I have the analytical expression of the radiation pressure/ volume :S = a exp(- r2) exp (-x2) ; where a is a constant, r is the radial component ant x is the axial one.
The function must return an x-momentum source term that varies with x and r position
The problem here is that the expression is not depending on x-velocity Vx so we can set dS[eqn] to dS/dVx
Do you have please any idea about haw can I write this UDF in a different way from that of the UDF manual-section 4.3.15
Thank you, I will be grateful
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