[struggle]

Hey there,


i am currently modeling a pressure intensifier for methyl alcohol. It consists of a check valve at the inlet (upper part), one at the outlet (lower part) and a cylinder (in between). I am getting a floating point error, when both valves are closing, creating three fluid areas, so when the cylinder is turning and going back.



I wonder how to solve this error, it might be the pressure-pressure BC or the split fluid volume. I am quite new to the topic so ther might be a simple solution to this.


I am using a 2d pressure based solver. Both inlet and outlet are pressure-BC, using the standart sst-k-omega-turbolence model, the cylinder is moving at 1Hz via a UDF rigid motion, valves are modeled via 1dof-solver, just as in the "check-valve" videos online. gap model for flow-blocking at the top/ sides of the valves. Layering for the moving cylinder, remeshing and smoothing for the fluid in valve-region.


Thank you very much for reading. I tried my best finding a solution myself, but i have limited knowledge and could not find an answer. All i found were tutorials using air, so i think that might be the issue.