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Create Accurate Pressure Boundaries – SOLIDWORKS Flow Simulation CFD – Advanced Flow Tips & Tricks 10/13

Create Accurate Pressure Boundaries in SOLIDWORKS Flow Simulation CFD

Let’s create a boundary condition on the lids to simulate openings to the atmosphere. And I’m just going to create a pressure opening where all these lids are. I do not recommend using environment pressure because it does some weird things. It’s static pressure in one direction, total pressure in the other. That means you’re going to get different static pressure values depending on the direction of flow and it’s not going to match up to what you expect. If there’s not significant pressures caused by moving air, I always use static pressure. You’ll rarely go wrong in that scenario because static pressure is what pressure gages are displaying in the real world.

 

The only thing environment pressure is giving you is the additional pressure of displacing air that’s not modeled in your study. And if it’s that important that you know how the displaced air affects your pressure, you probably should include that in your domain, which then allows you to go back to static pressure. Just understand that if there is a lot of air leaving the domain and it isn’t going to be fully developed or flowing to a lower pressure, you’ll need to find a way to account for that, and environment pressure is a simple but not very accurate way to do that.

 

To define the boundary I just grabbed all the bodies. That’s a really easy way to avoid any kind of a problem where it says a face you selected isn’t on the solid/fluid interface because it moved or there was a geometry change. Because I picked the body, as long as the body is touching the fluid it will calculate and it won’t throw errors about the other faces that are outside.

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