User defined field function.

karthik1413 · January 23, 2014, 05:53

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, 06:58

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

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

karthik1413 · January 23, 2014, 08:03

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

karthik1413 · January 23, 2014, 11:31

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

this is what i got..

January 23, 2014, 05:53	User defined field function.	#1
karthik1413 New Member bharadwaj karthik Join Date: Oct 2013 Posts: 4 Rep Power: 13	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[swak4Foam] installation problem with version 0.2.3	Claudio87	OpenFOAM Community Contributions	9	May 8, 2013 11:20
User defined function in CFX	ealatawi	CFX	3	November 13, 2011 19:18
[blockMesh] BlockMesh FOAM warning	gaottino	OpenFOAM Meshing & Mesh Conversion	7	July 19, 2010 15:11
user field function	girishg	STAR-CCM+	5	May 13, 2010 10:21
[blockMesh] Axisymmetrical mesh	Rasmus Gjesing (Gjesing)	OpenFOAM Meshing & Mesh Conversion	10	April 2, 2007 15:00

January 23, 2014, 06:58		#2
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	Isnt that simply projecting the pressure gradient vector onto the velocity vector? http://en.wikipedia.org/wiki/Vector_projection

January 23, 2014, 08:03		#3
karthik1413 New Member bharadwaj karthik Join Date: Oct 2013 Posts: 4 Rep Power: 13	Yes!!!!!!!!!! Thank you got it!!

January 23, 2014, 11:31		#4
karthik1413 New Member bharadwaj karthik Join Date: Oct 2013 Posts: 4 Rep Power: 13	(/(+(+(* $${Velocity}[0] $${ApparentPressureGradient}[0]) (* $${Velocity}[1] $${ApparentPressureGradient}[1])) (* $${Velocity}[2] $${ApparentPressureGradient}[2])) ${Velocity_0}) this is what i got..