Modify gravity through UDF

flotus1 · April 9, 2015, 03:21

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, 03:41

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, 05:55

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

April 9, 2015, 03:21	Modify gravity through UDF	#1
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	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?

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April 9, 2015, 03:41		#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, 05:55		#3
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,399 Rep Power: 46	Thank you for your suggestion. I will give this a try soon.