Learning Forum

[Chris Roberts]

Hello all,

I am trying to simulate a specific domain but I am getting a floating point error which I will design below. I have a large rectangular box that has a total surface area of 30,124mm^2. There are two pipes that enter and exit the box that have a surface area of 3.5 mm^2. One of the pipes is an exit to the fluid in the box which is a constant pressure outlet. The domain has two inlets. The first inlet is from one of the tubes that has a continuous flow of fluid of 5 ml/min. The second inlet is the entire face of the box (30,124 mm^2) that is producing an osscilating waveform of water into the domain. This is very unusual but this is simulation we are trying to do. However are getting a floating point error and suspect it is due to the large surface area of second inlet producing the pulse wave. Can someone please suggest any feedback that might help us narrow down the issue or try to fix the problem ? Thank you kindly. 

[Prashanth]

Hello: Make sure the pressure wave profile supplied at the inlet is physical, reduce the time step sizes if necessary, set physical back flow conditions as reversed flow is more noticeable in such cases.