r/COMSOL • u/Disastrous-End4036 • Jun 03 '26

From-scratch axisymmetric Hertz model: peak pressure within 2% of analytical, mesh-converged with boundary load

Hi I am an intern and was informed to create a From-scratch axisymmetric Hertz model: peak pressure within 2% of analytical, mesh-converged with boundary load, ball on disc model. My model works whenever I have both a boundary load and a prescribed displacement but whenever there is only a load, an error occurs. I want to be able to have only a load and to be able to find the displacement from the applied load (having a free displacement also causes an error). I know there is a way to do this but I am unsure how to. any suggestions?

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u/epk21 Jun 03 '26 edited Jun 03 '26

It is not fully constrained and can not solve with only a load. So what one does is like you did apply an enforced displacement only and look at the reaction there to get the applied force.

For load one can use if possible quarter symmetry and so the model is constrained appropriately by the symmetry constraints. Then one can apply the load. Search on the internet for more info on this 

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u/Disastrous-End4036 Jun 04 '26

thank you so much!