Learning Forum

[wesker_wang]

Hello all,   I am trying to simulate the air flow in a room with the effect of an air purifier. However, when I setup a vertical flow velocity on the top face of the air purifier within an extracted flow volume and run the simulation, nothing happens and there is no air coming out of the unit. When I assign a flow velocity on a side face of the unit, sometimes it works and sometimes it doesn't. Also, different faces have different simulation results while they should be the same because I didn't setup the gravity property. I don't know if this is because of the model I created or the algorithm used for instantaneous simulation. Is there a solution for my case?    

[Subashni Ravichandran]

Hello kkwang

I am not able to reproduce this issue. (check attached model)

Could you please elaborate on what was the boundary conditions you have implemented?
Could you please share the model with us so that I can investigate it?

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[wesker_wang]

Thank you Subashni

I tried your model and it works very well.

I attached my model which has similar boundary conditions (except for the pressure outlet) but doesn't give me similar results. My guess is that there is a constraint on the flow velocity boundary condition in its algorithms. 

🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions

[Subashni Ravichandran]

Hello kkwang The simulation runs as expected for me. Could you please try increasing your fidelity? It could be that the small inlet surfaces are not captured correctly.

[wesker_wang]

Hi Subashni  

I increased Fidelity and now it works perfectly. Thank you so much!