include force(acting at interface of two liquid only(VOF model)) term in momentum eq.

mayank199325 · June 7, 2014, 07:19

I want to include a force term (acting only at interface(moving) of two liquid(VOF model)) in momentum eq.

force=c*(grad of scalar in uds equation), c=constant

I have no idea how to do that, any help will be greatly appreciated

Thanks

lleite · July 15, 2014, 16:17

You will have to calculate this gradient first then add it as a source term in the cell zone conditions.

Basically write a compiled udf
1) Calculate the gradient via DEFINE_ADJUST
2) Calculate the force via DEFINE_SOURCE

Look at the Ansys manual(HELP) and see the examples in DEFINE_ADJUST/DEFINE_SOURCE

June 7, 2014, 07:19	include force(acting at interface of two liquid only(VOF model)) term in momentum eq.	#1
mayank199325 New Member Mayank Jain Join Date: Jun 2014 Posts: 3 Rep Power: 12	I want to include a force term (acting only at interface(moving) of two liquid(VOF model)) in momentum eq. force=c*(grad of scalar in uds equation), c=constant I have no idea how to do that, any help will be greatly appreciated Thanks

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July 15, 2014, 16:17		#2
lleite New Member leonardo Join Date: Jul 2014 Posts: 1 Rep Power: 0	You will have to calculate this gradient first then add it as a source term in the cell zone conditions. Basically write a compiled udf 1) Calculate the gradient via DEFINE_ADJUST 2) Calculate the force via DEFINE_SOURCE Look at the Ansys manual(HELP) and see the examples in DEFINE_ADJUST/DEFINE_SOURCE