CAD Scaling

The dimension of the model is very important for the simulation setup. Scaling the model in meters(m) or millimeters(mm) will have a large impact on the results. So it is important to check whether the CAD system export and the SimScale import has preserved the dimensions. This can be done via the Bounding box diagonal length in the Geometry Event Log after uploading the CAD model (see the figure below). For example if you chose to use SI units, SimScale expects the CAD model to be scaled in m. If that is not consistent with the model, then it is important to scale the CAD geometry within the SimScale platform.

The event log of the geometry upload

The event log of the geometry upload informs you about the entities of your model

In the example shown below the CAD model is not based on meters, as SimScale would have expected. Hence this leads to an exceptionally large bounding box length.


Upload of the CAD model of the inner domain of the cyclone separator

Original CAD model showing unrealistic dimensions

Therefore we need to apply a scaling operation with a factor of 0.01 to get it into the right dimension.


Applying a scaling operation onto the uploaded CAD model

Scaling Operation


After the scaling operation finishes, we can see the difference in the bounding box length, as shown below

Comparison of the bounding boxes before and after the scaling operation

Geometry log showing the new corrected dimension


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