Fluids

Fluids

Reference value VS Operating conditions

    • wcao
      Ansys Employee
      Fluent requires the specification of reference values and operating conditions. What is the difference between the two?n
    • Konstantine Kourbatski
      Ansys Employee
      Reference values are used in post-processing to calculate derived physical quantities and non-dimensional coefficients like force coefficients, Reynolds number, heat transfer coefficient, Nusselt number etc. They are not used during the solve stage to compute the flow field and does not affect the numerical solution. Still it is advisable to set them to the characteristic values used in the simulation for appropriately scaling post-processing quantities (e. g. reference length = cord length of an airfoil when calculating force coefficients).nOn the other hand, operations conditions are used in the calculation of primary physical quantities. For example, in flows affected by the gravity, e. g. free-surface wave motion or free convection, gravitational acceleration will be used in the momentum equations. Likewise, in natural convection problems, either the operating density or operating temperature will be used when calculating source terms of the momentum equations.nFor more, information, refer to the following sections of Fluent 2020 User Guide:n7.3. Operating Conditionsn41.12.1. Setting Reference Valuesn
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