Define_dpm_bc

ehsan105 · October 5, 2015, 13:30

in
DEFINE_DPM_BC

What is the purpose of the highlighted؟

`e` · October 5, 2015, 18:58

This code snippet is from the UDF manual (an example for the DEFINE_DPM_BC macro). They're evaluating the Weber number which requires the relative velocity between the particle and wall. The highlighted line calculates the face velocity on a moving boundary (using the moving/deforming mesh model).

ehsan105 · October 6, 2015, 09:39

I'm looking for other example of DEFINE_DPM_BC.
are you can help me?

`e` · October 6, 2015, 18:13

Have you read the UDF manual and tried their examples? What are you trying to achieve with the boundary condition?

ehsan105 · October 8, 2015, 19:07

Quote:

Originally Posted by `e`

Have you read the UDF manual and tried their examples? What are you trying to achieve with the boundary condition?

dear my friend
thanks for your response,
yes, I have red the examples of udf manual, and also have been trying to learn this code, I really require more examples to increase my information on this field of study, I was wondering if you could give me more examples and some evidence helping me learn UDF of DPM field.

pakk · October 12, 2015, 06:07

You learn the most from making examples, not from reading examples. Try to make a bc where particles are reflected 50% of the time, and stick the other 50%. Or let them stick if the velocity is below 1 m/s, and reflect with (initial velocity-1m/s) otherwise. And if you run into problems, ask here.

ehsan105 · November 10, 2015, 15:31

Quote:

Originally Posted by pakk

You learn the most from making examples, not from reading examples. Try to make a bc where particles are reflected 50% of the time, and stick the other 50%. Or let them stick if the velocity is below 1 m/s, and reflect with (initial velocity-1m/s) otherwise. And if you run into problems, ask here.

Can I ask? for more tips, more help, Thank you so much

pakk · November 12, 2015, 05:36

Yes, of course you can ask. Put your question here and we will see if we can give an answer.

t.z · November 16, 2015, 03:46

Quote:

Originally Posted by ehsan105

in
DEFINE_DPM_BC

What is the purpose of the highlighted؟

hi
i am trying to define DPM boundary condition in gas-solid flows, can anyone help me?

pakk · November 16, 2015, 09:21

Maybe, it depends on what your problem is. Show your code, explain the problem, and we can try to help.

October 5, 2015, 13:30	Define_dpm_bc	#1
ehsan105 New Member ehsan Join Date: Oct 2015 Location: tehran Posts: 26 Rep Power: 11	in DEFINE_DPM_BC What is the purpose of the highlighted؟

October 5, 2015, 18:58		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	This code snippet is from the UDF manual (an example for the DEFINE_DPM_BC macro). They're evaluating the Weber number which requires the relative velocity between the particle and wall. The highlighted line calculates the face velocity on a moving boundary (using the moving/deforming mesh model). ehsan105 likes this.

October 6, 2015, 09:39	thank you	#3
ehsan105 New Member ehsan Join Date: Oct 2015 Location: tehran Posts: 26 Rep Power: 11	I'm looking for other example of DEFINE_DPM_BC. are you can help me?

October 6, 2015, 18:13		#4
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Have you read the UDF manual and tried their examples? What are you trying to achieve with the boundary condition? ehsan105 likes this.

October 12, 2015, 06:07		#6
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 27	You learn the most from making examples, not from reading examples. Try to make a bc where particles are reflected 50% of the time, and stick the other 50%. Or let them stick if the velocity is below 1 m/s, and reflect with (initial velocity-1m/s) otherwise. And if you run into problems, ask here. ehsan105 likes this.

November 12, 2015, 05:36		#8
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 27	Yes, of course you can ask. Put your question here and we will see if we can give an answer.

November 16, 2015, 09:21		#10
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 27	Maybe, it depends on what your problem is. Show your code, explain the problem, and we can try to help.