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Multiphase, how to change my simulaiton to "transient?" |
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August 19, 2010, 19:20 |
Multiphase, how to change my simulaiton to "transient?"
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#1 |
New Member
max
Join Date: Aug 2010
Posts: 19
Rep Power: 15 |
I have a simulation with 3 particles, and i would like to figure out a way to see if i can get some to "stick" to the wall of my vessel. I changed my wall interaction from "Equation Dependent" to "Wall Film". However, i can not see to fix this error. I have changed every valuable imaginable. Any ideas? I can upload screen shots if that would help anyone...i just dont know what i would upload.
Thanks a lot everyone! Ive been trying to fix this for a while...... "Simulations involving the particle wall film option are only allowed for transient simulations. Please change your setup and rerun the case." |
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August 19, 2010, 19:28 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
Only use the wall film model if you actually want to model a film on the wall.
If you want your particles to stick to the wall simply use a restitution coefficient of 0 on the wall you want it to stick to. |
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August 20, 2010, 06:02 |
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#3 |
New Member
max
Join Date: Aug 2010
Posts: 19
Rep Power: 15 |
Hi!
I selected "default domain default" and switched from wall film to "equation dependent". Where it says velocity i selected perpendicular coeff to 0, as well as parallel coeff to 0. Minimum impact angle, erosion model, mass flow absorption and particle behavior were not selected. When i run it (and there are no errors!) i am able to get to CFD-post but when i run the animation the little balls still go all the way through, they still dont stick. Am i doing something wrong? Thanks again! |
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August 22, 2010, 19:28 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
Yes, you are doing something wrong. Turn the wall film model off! Wall films can absorb and emit particles and so appear as if the particles are bouncing off.
Also note you set the restitution coefficients per wall area so if you have multiple wall areas you will need to set it for each wall. |
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August 23, 2010, 01:26 |
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#5 |
New Member
max
Join Date: Aug 2010
Posts: 19
Rep Power: 15 |
I did that, and after a bunch of simulations i noticed a few of the particles stop, but only after they hit the wall, then they roll for a while, then stop....then they disappear. Is there a way to fiddle with the settings so that as soon as the balls hit the wall they stop immediately? And stay there so i can count them?
Thank you very much for your time! |
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August 23, 2010, 08:33 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
If you have the restitution coef set to 0 then they are not hitting and sliding. They will be a small distance off and caught in the boundary layer.
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