when to use pseudo transient method

- September 16, 2019 at 10:29 am
  
  ANKITAPUJAHARI
  Subscriber
  
  Hello,
  
  I am using supercritical co2 from the NIST database at a very high operating pressure of 7.9 Mpa. I have used discrete heat sources and solving it using pressure-based coupled solver. The residuals start oscillating after some time and when I activate the pseudo transient method then only it is converging. But when I activate the pseudo transient method at the very beginning and initializing the simulation.. it is not converging. Is it wrong to activate pseudo transient method in the middle of the simulation when the residuals start oscillating?
- November 18, 2019 at 6:21 am
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  Everytime you want to solve steady with the pressure based solver.
- November 18, 2019 at 6:22 am
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  Sometime only coupled option and some CFL tuning might behave better.