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SimScale Mesh and Simulation

Find out how to create the computational mesh and run wind simulations in SimScale in this video from Dr. Ico Broekhuizen.
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Once we’ve set up all of those settings in SimScale, the next step is to define the computational mesh. So basically, we are dividing this entire simulation domain into millions of small elements on which the simulation will then be carried out. There’s a few different algorithms you can use for this in Simscale where hex-dominant usually works well for wind around buildings. However, if you get some error in the meshing process or the simulation process, you can also try using the standard version instead. Then use the internal meshing mode with the sizing set to automatic, and then you can specify how fine or coarse you want the mesh to be.
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The finer the mesh, the more detailed the results will be, but it’ll also make the simulation take more time.
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So quite often you will start with a quite coarse resolution for the mesh for your early design work and move to a finer mesh the further along you get. And so with those settings, you can then click generate and SimScale will start generating this mesh. And this will take some time and you’ll get an email about this when it is finished, and then you can come back to see what the mesh will look like.
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Here is a mesh that I prepared earlier, if you switch the render mode to a wire frame here, you can quite clearly see the outline of the mesh on the sides of the wind tunnel and on all the buildings as well. So you can see that you’ve automatically ended up with a much finer mesh here around the corners of the simulation domain and around all the buildings in the middle as well. And in between that the elements are larger.
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And this is done so that we only use the high resolution at the areas where it is really needed, and we don’t waste too much time on the computation of the things that are happening in the middle of the domain, far away from any of the edges or buildings.
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So once that is done, you can add a new simulation run as well. And here you can also specify a different name to help you identify what this run is, for example, what wind speeds you use as the inputs. It will show you some estimate of how long it will take to perform this simulation. And again, you will get an email once this is done.
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And depending on how fine the mesh and how many elements, this can take some minutes or even some hours for very large models.

Wind simulations in SimScale are carried out on a computational mesh that divides the air volume into millions of small elements. In this video, Dr. Ico Broekhuizen explains how to generate this mesh so that you can then start the simulation run.

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