how to change pressure-inlet to velocity-inlet and make sure the pressure value is appropiate

- July 9, 2019 at 3:59 pm
  
  Jirong
  Subscriber
  
  Hello!
  
  I am working on a FSI problem and using FLUENT for my fluid part. I was simulating the heart valve with pressure-inlet BC. But after I changed the pressure-inlet to velocity-inlet BC. The pressure value became extraordinary high and the model was collapsed right away. Is there anything I need to change besides velocity profile? I did change initial gauge pressure to 0 Pa and outlet gauge pressure is 0 Pa too.
- July 9, 2019 at 3:59 pm
  
  Jirong
  Subscriber
- July 10, 2019 at 6:13 am
  
  DrAmine
  Ansys Employee
  
  What do you know more: pressure or velocity? If you know the pressure upstream I will use pressure inlet which fixes the total pressure there. The large pressure you are getting with velocity inlet might be to wrong pressure field due to large displacements and fluids responses etc..
  
  Probably you require implicit update + solution stabilization but you said with pressure inlet it was working fine!
  
  Moreover always try to model with compressible liquid or compressible gases.
- July 10, 2019 at 5:01 pm
  
  Jirong
  Subscriber
  
  Hi Amine,
  
  Thanks for your suggestion.
  
  I did already solve it with pressure-inlet with non-Newtonian power law for my fluid model. But I want to try velocity-inlet to see if two results can match. And you are correct, my model has large displacement so that pressure is super high. Is there anyway to avoid wrong pressure results?
  
  Regards,
  
  Jirong

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