Simplifying Complex Models for SOLIDWORKS Flow Simulation CFD - Advanced Flow Tips & Tricks

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Let's jump into this really complex assembly and see what we can do to simplify and then analyze it. It's going to be a difficult analysis. Because there's just a lot going on here. There are slots along the side for airflow. We're gonna assume free convection, at least initially.

This is a sheet metal enclosure, so we already know we're gonna have a problem with leaks in the corners where the bends don't quite overlap. If you look around the button, there is an opening, so we've got a lot of geometry preparation to do. Look inside and we've got a lot of complex shapes that need to be simplified. Our goal is to get this as simplified as we possibly can.

The first one that jumps out to me is the circuit board, which often has really messed up geometry. If you run check geometry on most circuit boards, it will identify problems. I recommend selecting all the bodies except the board, and suppress them. Just get rid of them for the initial setup and troubleshooting of the geometry. Keep in mind, you can always come back and unsuppress the components, but it at least is going to streamline and simplify for now. If you get to the point where you're solving a study, and that study runs efficiently, you can turn them back on to maximize accuracy.

For a body with a lot of complexity, I'm going to use a feature called defeature. Defeature is a great way to simplify geometry. It will basically get rid of all the holes and any other small geometry. I don't really do much of anything other than say select all holes to remove, but more effort will give a more thorough result. The result can be saved as a configuration and used at the top-level assembly.

Another method you might want to use is delete face. Delete and patch does a nice job of removing things like letters, but they can be hard to select all of them.

You can select components by size to get rid of unnecessary components. This is great if you have small components, but it doesn't work on small bodies in a multi-body part. With Select by Size, you can turn on Dynamic Selection and then just drag the slider up and down until it grabs only the components that you don't mind losing. Removing all of the fasteners and couple other little things here and there is a big help. It didn't grab all these connectors, but that's probably because those are bodies in a multibody. I'm going to suppress all of these small components and we're doing much better than when we started.

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