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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › udf compiles the air equation of state › Reply To: udf compiles the air equation of state

December 23, 2024 at 12:47 pm
ntwy88
Subscriber

Thank you for your response. One question here is that the equation of state for compressible liquids in fluent is Tait's equation, may I ask if you mean not to write it as udf? I want to model a situation where negative pressure occurs in liquid water, and the air equation of state can't have negative pressure using an ideal gas. After I modified the equation of state for air using udf according to Tait's equation, it shows floating point overflow non-convergence when compressible liquid water droplet velocity exceeds 20m/s hitting the wall in still air.Â