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.
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.
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.
After the scaling operation finishes, we can see the difference in the bounding box length, as shown below
Geometry log showing the new corrected dimension