6 DOF UDF touch wall

asier · June 28, 2013, 08:00

I'm simulating a particle in a tube with a flow using 6 DOF UDF. The problem I've got is that Fluent gives me an error (negative cell found) when this rigid particle touches the wall of the tube. I don't know if there is any solution. Thanks

And if I define two different rigid particles, if I will get the same error when they touch each other.

sadjad.s · June 28, 2013, 15:55

Hi mate,
As far as I know Fluent can not model strike of two walls with 6DoF.
You see, this process is rather mechanical.

asier · June 28, 2013, 17:23

Thanks for your answer.

Just say that I don't want to smash a particle against a wall, I've got a curve pipe and I want to see how particles with different shapes behave. Is not possible with fluent? When the particle touches the wall I get always the error.

Thanks again mate

sadjad.s · June 29, 2013, 05:32

I have already tried what you want but it seems impossible with fluent.

youiithe · March 27, 2015, 21:38

Hi
I want to simulate a similar case that a particle float in a vertical tube. The solver can give right pressure contour map if the dynamic mesh is off while pressure will be a mess if it is on. That is to say, with wrong pressure, buoyancy cannot be true.
I hope to hear from you, Thank you!

sadjad.s · March 29, 2015, 14:58

Attach some pictures or else.with this information i can't help.

youiithe · March 30, 2015, 23:08

Quote:

Originally Posted by sadjad.s

Attach some pictures or else.with this information i can't help.

Hi，3q u for rippling!
Can I have your email for it is not easy for me to upload pics!

June 28, 2013, 08:00	6 DOF UDF touch wall	#1
asier New Member Join Date: Mar 2013 Posts: 5 Rep Power: 13	I'm simulating a particle in a tube with a flow using 6 DOF UDF. The problem I've got is that Fluent gives me an error (negative cell found) when this rigid particle touches the wall of the tube. I don't know if there is any solution. Thanks And if I define two different rigid particles, if I will get the same error when they touch each other.

June 28, 2013, 15:55	Answer	#2
sadjad.s Member sadjad Join Date: Jan 2012 Posts: 72 Rep Power: 14	Hi mate, As far as I know Fluent can not model strike of two walls with 6DoF. You see, this process is rather mechanical. __________________ ICEM, CFX and Fluent expert

June 28, 2013, 17:23	Thanks	#3
asier New Member Join Date: Mar 2013 Posts: 5 Rep Power: 13	Thanks for your answer. Just say that I don't want to smash a particle against a wall, I've got a curve pipe and I want to see how particles with different shapes behave. Is not possible with fluent? When the particle touches the wall I get always the error. Thanks again mate

June 29, 2013, 05:32	Reanswer	#4
sadjad.s Member sadjad Join Date: Jan 2012 Posts: 72 Rep Power: 14	I have already tried what you want but it seems impossible with fluent. __________________ ICEM, CFX and Fluent expert

March 27, 2015, 21:38	Same situation, different question	#5
youiithe New Member Wei Liu Join Date: Mar 2015 Posts: 5 Rep Power: 11	Hi I want to simulate a similar case that a particle float in a vertical tube. The solver can give right pressure contour map if the dynamic mesh is off while pressure will be a mess if it is on. That is to say, with wrong pressure, buoyancy cannot be true. I hope to hear from you, Thank you!

March 29, 2015, 14:58		#6
sadjad.s Member sadjad Join Date: Jan 2012 Posts: 72 Rep Power: 14	Attach some pictures or else.with this information i can't help. __________________ ICEM, CFX and Fluent expert

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