AcuSolve: Default pressure setting

Rahul_P1
Rahul_P1
Altair Employee
edited October 2020 in Community Q&A

Hi!

Who know what is default pressure in AcuSolve?
If I want to do a simulation at atmospheric pressure 1 atm (101325 Pa), do I need to enter the value in any section? such as at absolute pressure offset or pressure initial condition (in Nodal Initial Condition)??

Thanks

52am4-2014-05-19_135830.jpg

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Answers

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    If you are doing incompressible both these settings are not required.
    Absolute pressure offset would be necessary for compressible cases likes workshop5 compressible nozzle.

    Nodal Initial conditions for pressure are generally not required. NIC typically help in convergence. Generally I would use them for temperature and eddy viscosity (at times for velocity, it is a flow only in one direction).

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    In addition to that, most CFD cases are velocity/mass flux at inlet and pressure =0 (relative to atmosphere) at outlet.
    Most not all...

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    thanks ydigit for ur respond..

    So, for incompressible flow what is the means of negative pressure? Does it means that actual pressure is lower than atmospheric pressure (1 atm)?

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited February 2015

    For incompressible flow, negative pressure would mean lower than atmospheric pressure. (aka negative relative pressure)
    Absolute negative pressure would not make sense.

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