User defined field function.

karthik1413 · January 23, 2014, 04:53

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

flotus1 · January 23, 2014, 05:58

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

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

karthik1413 · January 23, 2014, 07:03

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

karthik1413 · January 23, 2014, 10:31

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

this is what i got..

January 23, 2014, 04:53	User defined field function.	#1
karthik1413 New Member bharadwaj karthik Join Date: Oct 2013 Posts: 4 Rep Power: 12	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

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January 23, 2014, 05:58		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	Isnt that simply projecting the pressure gradient vector onto the velocity vector? http://en.wikipedia.org/wiki/Vector_projection

January 23, 2014, 07:03		#3
karthik1413 New Member bharadwaj karthik Join Date: Oct 2013 Posts: 4 Rep Power: 12	Yes!!!!!!!!!! Thank you got it!!

January 23, 2014, 10:31		#4
karthik1413 New Member bharadwaj karthik Join Date: Oct 2013 Posts: 4 Rep Power: 12	(/(+(+(* $${Velocity}[0] $${ApparentPressureGradient}[0]) (* $${Velocity}[1] $${ApparentPressureGradient}[1])) (* $${Velocity}[2] $${ApparentPressureGradient}[2])) ${Velocity_0}) this is what i got..