outlet conditions
 

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.??

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

Can you post an image of what you are modelling and the flow applied to it?

this is the mesh, I need to model the water particles track where they become trapped in the grooves of the vent.

If the flow is high Re then your exit boundary is too close. You need to move it downstream - bratzinger's comment is correct.