BCTurbulentSupersonicInflow.c File Reference

Turbulent supersonic inflow boundary condition (specific to the 3D Navier-Stokes system). More...

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <basic.h>
#include <arrayfunctions.h>
#include <boundaryconditions.h>
#include <mpivars.h>

Go to the source code of this file.

Functions
int	BCTurbulentSupersonicInflowU (void *b, void *m, int ndims, int nvars, int *size, int ghosts, double *phi, double waqt)

Detailed Description

Turbulent supersonic inflow boundary condition (specific to the 3D Navier-Stokes system).

Author

Debojyoti Ghosh

Definition in file BCTurbulentSupersonicInflow.c.

Function Documentation

int BCTurbulentSupersonicInflowU	(	void *	b,
		void *	m,
		int	ndims,
		int	nvars,
		int *	size,
		int	ghosts,
		double *	phi,
		double	waqt
	)

Applies the turbulent supersonic inflow boundary condition: The inflow consists of a mean supersonic inflow on which turbulent flow fluctuations are added. This boundary condition is specific to the 3D Navier-Stokes system (NavierStokes3D).

Note: Some parts of the code may be hardcoded for use with the shock-turbulence interaction problem (for which this boundary condition was written).

Parameters

b	Boundary object of type DomainBoundary
m	MPI object of type MPIVariables
ndims	Number of spatial dimensions
nvars	Number of variables/DoFs per grid point
size	Integer array with the number of grid points in each spatial dimension
ghosts	Number of ghost points
phi	The solution array on which to apply the boundary condition
waqt	Current solution time

Definition at line 21 of file BCTurbulentSupersonicInflow.c.

{
  DomainBoundary *boundary = (DomainBoundary*) b;

  int dim   = boundary->dim;

  double *inflow_data = boundary->UnsteadyDirichletData;
  int    *inflow_size = boundary->UnsteadyDirichletSize;

  if (ndims == 3) {

    /* create a fake physics object */
    double gamma;
    gamma = boundary->gamma;
    double inv_gamma_m1 = 1.0/(gamma-1.0);

    if (boundary->on_this_proc) {
      /* the following bit is hardcoded for the inflow data
       * representing fluctuations in a domain of length 2pi */
      double  xt = boundary->FlowVelocity[dim] * waqt;
      int     N  = inflow_size[dim];
      double  L  = 2.0 * (4.0*atan(1.0));
      int     it = ((int) ((xt/L) * ((double)N))) % N;

      int bounds[ndims], indexb[ndims];
      _ArraySubtract1D_(bounds,boundary->ie,boundary->is,ndims);
      _ArraySetValue_(indexb,ndims,0);
      int done = 0;
      while (!done) {
        int p1; _ArrayIndex1DWO_(ndims,size,indexb,boundary->is,ghosts,p1);
        
        /* set the ghost point values - mean flow */
        double rho_gpt, uvel_gpt, vvel_gpt, wvel_gpt, energy_gpt, pressure_gpt;
        rho_gpt      = boundary->FlowDensity;
        pressure_gpt = boundary->FlowPressure;
        uvel_gpt     = boundary->FlowVelocity[0];
        vvel_gpt     = boundary->FlowVelocity[1];
        wvel_gpt     = boundary->FlowVelocity[2];

        /* calculate the turbulent fluctuations */
        double duvel , dvvel , dwvel ;
        int index1[ndims]; _ArrayCopy1D_(indexb,index1,ndims);
        index1[dim] = it;
        int q; _ArrayIndex1D_(ndims,inflow_size,index1,0,q);
        duvel = inflow_data[q*nvars+1];
        dvvel = inflow_data[q*nvars+2];
        dwvel = inflow_data[q*nvars+3];

        /* add the turbulent fluctuations to the velocity field */
        uvel_gpt      += duvel;
        vvel_gpt      += dvvel;
        wvel_gpt      += dwvel;

        /* set the ghost point values */
        energy_gpt   = inv_gamma_m1*pressure_gpt
                       + 0.5 * rho_gpt 
                       * (uvel_gpt*uvel_gpt + vvel_gpt*vvel_gpt + wvel_gpt*wvel_gpt);
        phi[nvars*p1+0] = rho_gpt;
        phi[nvars*p1+1] = rho_gpt * uvel_gpt;
        phi[nvars*p1+2] = rho_gpt * vvel_gpt;
        phi[nvars*p1+3] = rho_gpt * wvel_gpt;
        phi[nvars*p1+4] = energy_gpt;

        _ArrayIncrementIndex_(ndims,bounds,indexb,done);
      }
    }

  }
  return(0);
}