User defined field function.
 

Hello all i want to write a user defined field function for the streamwise pressure gradient.(I am trying to refine mesh based on the field functions).I have extracted the apparent pressure gradient by using the temporary storage retained feature.Can someone please help me to define the "streamwise pressure gradient" using the apparent pressure gradient.Thanks

Regards
Karthik

Isnt that simply projecting the pressure gradient vector onto the velocity vector?

http://en.wikipedia.org/wiki/Vector_projection

Yes!!!!!!!!!! Thank you got it!!

(/(+(+(* $${Velocity}[0] $${ApparentPressureGradient}[0]) (* $${Velocity}[1] $${ApparentPressureGradient}[1])) (* $${Velocity}[2] $${ApparentPressureGradient}[2])) ${Velocity_0})

this is what i got..