Modify gravity through UDF

flotus1 · April 9, 2015, 04:21

Short question: Is it possible to change the gravity vector through a udf? And how?

Related question: Is it possible to apply a momentum source to only ONE of the species in a VOF simulation using a udf?

`e` · April 9, 2015, 04:41

Disable gravity under Define > General... and include the gravity as a source term using a UDF. I've included a custom treatment of the gravity force in the DPM with DEFINE_DPM_BODY_FORCE and there should be a similar method with source terms in your Eulerian phase.

Try using an if statement to restrict your momentum source to a particular species thread pointer.

flotus1 · April 12, 2015, 06:55

Thank you for your suggestion.
I will give this a try soon.

April 9, 2015, 04:21	Modify gravity through UDF	#1
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	Short question: Is it possible to change the gravity vector through a udf? And how? Related question: Is it possible to apply a momentum source to only ONE of the species in a VOF simulation using a udf?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDF Compilation Error - Loading Library - COMMON Problem! Help!	robtheslob	Fluent UDF and Scheme Programming	8	July 24, 2015 01:53
modify a intern variable of Fluent with scheme and UDF	fanch33	Fluent UDF and Scheme Programming	3	March 2, 2015 12:01
How can I modify surface reaction using UDF	Juun	Fluent UDF and Scheme Programming	0	July 28, 2014 10:13
Source Term UDF VS Porous Media Model	pchoopanya	Fluent UDF and Scheme Programming	1	August 28, 2013 07:12
DEFINE_GEOM UDF Problems	Pat	FLUENT	0	August 14, 2003 14:16

April 9, 2015, 04:41		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Disable gravity under Define > General... and include the gravity as a source term using a UDF. I've included a custom treatment of the gravity force in the DPM with DEFINE_DPM_BODY_FORCE and there should be a similar method with source terms in your Eulerian phase. Try using an if statement to restrict your momentum source to a particular species thread pointer.

April 12, 2015, 06:55		#3
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	Thank you for your suggestion. I will give this a try soon.