Using the compressible solver at steady state with k-omega SST turbulence model. I am simulating external flow over a delta wing at high altitude conditions.
I have tried setting initial conditions, subdomain, and velocity inlet temperature to both 216K and 223K, but get the same FOAM FATAL ERROR: Negative initial temperature T0: -26.3 (at 216K) and T0: -14.3 (at 223K). The error occurs at the very first time step.
Interestingly the negative T0 value scales with the temperature — lower temperatures produce more negative T0 values, suggesting a fixed offset is being subtracted somewhere internally.
All temperature values are set in Kelvin. Pressure is set to 7,170 Pa (60,000ft altitude) and velocity inlet is 280 m/s.
Is there a minimum temperature limit in the compressible solver, or a known unit conversion issue at low temperatures?
Thank you for any responses.