track isosurface in UDF

EternalEnvy · December 19, 2017, 04:58

Hi guys~ I am recently working on the simulation of laser welding, using the VOF method. I planed to add recoil evaporation pressure model into the simulation, but failed to find the accurate surface between the material phase and the air phase, where the pressure should be applied.

I know that I can construct the isosurface(VOF = .5) to represent the interface, which is quite easy during post-processing, however, I need to track the surface all the time during my calculation loops. Do you know any functions or macrons that I can use here? Or I have to write the code myself?

Thanks

annan · February 16, 2018, 04:54

Hello EternalEnvy,

I have the same problem like yours, have you managed to find a way to track the isosurface in your calculations ?

Thank you in advance

EternalEnvy · March 1, 2018, 22:32

Well, not really. I gave up tracking the interface, instead, using divergence theory, I changed the face-distributed pressure into the cell-distributed force.

pirsig · March 23, 2018, 12:30

Hello EternalEnvy,

Did you add recoil pressure to your pressure balance equation or to your source term? And what formula did you use for either case.

Thank you in advance

December 19, 2017, 04:58	track isosurface in UDF	#1
EternalEnvy New Member Alex Join Date: Dec 2017 Posts: 13 Rep Power: 9	Hi guys~ I am recently working on the simulation of laser welding, using the VOF method. I planed to add recoil evaporation pressure model into the simulation, but failed to find the accurate surface between the material phase and the air phase, where the pressure should be applied. I know that I can construct the isosurface(VOF = .5) to represent the interface, which is quite easy during post-processing, however, I need to track the surface all the time during my calculation loops. Do you know any functions or macrons that I can use here? Or I have to write the code myself? Thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Problem with DPM simulation with particles injection and EXECUTE_AT_THE_END UDF.	Ari	Fluent UDF and Scheme Programming	4	May 31, 2016 09:51
udf for multiple reaction	alihosseini63	Fluent UDF and Scheme Programming	0	July 4, 2013 19:37
Help me to check my UDF	Liufeng_ustb	Fluent UDF and Scheme Programming	2	May 7, 2013 11:25
isosurface in CFD-Post for transient rotor-stator simulations	blacksoil2012	CFX	1	May 29, 2012 20:07
DEFINE_ON_DEMAND UDF: How to declare A[ND_ND], etc	jx	FLUENT	1	November 6, 2003 18:23

February 16, 2018, 04:54		#2
annan Member annan Join Date: Nov 2016 Posts: 72 Rep Power: 10	Hello EternalEnvy, I have the same problem like yours, have you managed to find a way to track the isosurface in your calculations ? Thank you in advance

March 1, 2018, 22:32		#3
EternalEnvy New Member Alex Join Date: Dec 2017 Posts: 13 Rep Power: 9	Well, not really. I gave up tracking the interface, instead, using divergence theory, I changed the face-distributed pressure into the cell-distributed force.

March 23, 2018, 12:30		#4
pirsig New Member Join Date: Mar 2018 Posts: 1 Rep Power: 0	Hello EternalEnvy, Did you add recoil pressure to your pressure balance equation or to your source term? And what formula did you use for either case. Thank you in advance