[suleman]

Hi i am modelling a situation where a pipe has cryogenic hydrogen liquid flowing through it and there's a domain around it with hot air blowing which heats up the hydrogen in the pipe. The hydrogen is assumed to remain a supercritical fluid at 7MPA up to temperatures of around 200 -250k, the inlet temp of the hydrogen is 40k and the pressure is 7MPA. I ran two models, one where the hydrogen was assumed to have constant density and one where i assumed the density was changing according to the compressible liquid setting. For the constant density model i had no errors and there was convergence with the expected results. Then the only thing i changed was the hydrogens density setting to be modelled as compressible liquid and now i get a floating point exception error. I also changed the inlet and outlet from velocity inlet and pressure outlet to mass flow inlet and mass flow outlet for the hydrogen. Can anyone help with this, i dont think its a mesh problem as the constant density model had the same mesh and worked. I believe its the same problem that this user had below and any help would be greatly appreciated

https://innovationspace.ansys.com/fo...ion-diverging/

[MKuhn]

A compressible liquid is not the same as a supercritcal fluid. I think we are here still below the critical temperature of the fluid. Try it with your own density correlation.