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AMReX-Combustion / PelePhysics

A collection of physics databases and implementation code for use with the Pele suite of of codes
https://amrex-combustion.github.io/PelePhysics/
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Fix default viscosity_mu_ref value in Sutherland model #502

Closed JhonCordova closed 5 months ago

JhonCordova commented 5 months ago

Changes Made

I have corrected the default value of viscosity_mu_ref in the Sutherland transport model. The original value was 17.16, and I have changed it to 17.16e-5.

struct TransParm<EOSType, SutherlandTransport>
{
  amrex::Real Prandtl_number{0.7};
  amrex::Real viscosity_mu_ref{17.16e-5};  // Corrected value
  amrex::Real viscosity_T_ref{273.15};
  amrex::Real viscosity_S{110.4};
  amrex::Real const_bulk_viscosity{0.0};
  amrex::Real const_diffusivity{1.0};
  bool use_soret = false;
};

Justification

The reference viscosity value (viscosity_mu_ref) for air at standard temperature (273.15 K) is 17.16 µPa·s according to the literature. In the CGS system, this value should be expressed as 17.16e-5 Poise (P), since 1 Pa·s = 10 Poise. The original default value of 17.16 is incorrect in this context as it does not account for this unit conversion.