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August 27, 2012, 05:34 |
outlet conditions
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#1 |
New Member
henry
Join Date: Aug 2012
Posts: 2
Rep Power: 0 |
hey im new to CFX and am just starting a project at a new company where i am looking at two phase flow, water particles in air through a vane/vent type enclosure.
i am having problems with my outlet conditions, is it possible to not have to input and conditions here, I have tried just setting the static pressure but this puts up a wall which restricts flow, setting a velocity changes the flow through the vent.. I also tried using an opening as opposed to an outlet but it crashed every time. Not sure If theres probably a very simple solution to this problem.?? |
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August 27, 2012, 07:39 |
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#2 |
New Member
Join Date: Jul 2012
Location: Germany
Posts: 23
Rep Power: 13 |
Hi
i would enlarge the outflow region and evaluate the plane where your former outlet region was or evaluate a bit downstream otherwise the results could be compromised because the outlet condition forces the eddy to end upstream(noticed that in an OpenFOAM-case with outlet-condition) or you could have problems with convergence(my experience with a heatflow analysis in an Ansys-case where i tried to set the inflow-temperature of the opening-condition with an massFlowAve(T)@outlet-expression) and maybe the missing convergence causes the solver to crash in your case |
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August 27, 2012, 07:55 |
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#3 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Can you post an image of what you are modelling and the flow applied to it?
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August 27, 2012, 21:03 |
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#4 |
New Member
henry
Join Date: Aug 2012
Posts: 2
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this is the mesh, I need to model the water particles track where they become trapped in the grooves of the vent.
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August 28, 2012, 07:23 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
If the flow is high Re then your exit boundary is too close. You need to move it downstream - bratzinger's comment is correct.
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Tags |
cfx, outlet boundary condition |
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