[kmandar]

Dear SU2 developers,

I am running a case with Roe upwind scheme. According to the code at

numerics_direct_mean.cpp:1633,
CUpwRoe_Flow::ComputeResidual,

I see that the entropy fix is done as:

 /*--- Compute absolute value with Mavriplis' entropy correction ---*/
  
  MaxLambda = fabs(ProjVelocity) + RoeSoundSpeed;
  Delta = config->GetEntropyFix_Coeff();
  
  for (iVar = 0; iVar < nVar; iVar++) {
    Lambda[iVar] = max(fabs(Lambda[iVar]), Delta*MaxLambda);
  }

However, I could not find a reference for this, at least in the SU2 paper (AIAA 2013-0287). Could you please provide some details about the entropy fixing scheme?

Thanks,
Mandar