IBIdentifyMode.c File Reference

Identify 2D/3D mode for immersed body simulations. More...

#include <string.h>
#include <immersedboundaries.h>

Go to the source code of this file.

Functions
int	IBIdentifyMode (double *X, int *dim, void *ib)

Detailed Description

Identify 2D/3D mode for immersed body simulations.

Author

Debojyoti Ghosh

Definition in file IBIdentifyMode.c.

Function Documentation

int IBIdentifyMode	(	double *	X,
		int *	dim,
		void *	ib
	)

Identify the "mode", i.e., whether the simulation is a true 3D simulation, or a 2D simulation being run in 3D. If extent of the immersed body is larger than the grid along a particular axis (say, x), then we assume that the intention is to simulate a 2D case around a 2D body in the plane normal to that axis ( y-z plane ).

For example, to simulate a 2D cylinder in the x-y plane, we consider a cylinder whose extent along z is larger than the extent of the grid along z, i.e., it sticks out of the computational domain at both ends.

If the immersed body is completely contained within the computational domain, or sticks out only on one end along a particular dimension, we assume it's a 3D simulation.

Parameters

X	Array of global spatial coordinates
dim	global dimensions
ib	Immersed boundary object of type ImmersedBoundary

Definition at line 24 of file IBIdentifyMode.c.

{
  ImmersedBoundary  *IB = (ImmersedBoundary*) ib;
  Body3D            *body   = IB->body;

  double *x = X, *y = x + dim[0], *z = y + dim[1];

  double grid_xmin = x[0],
         grid_xmax = x[dim[0]-1],
         grid_ymin = y[0],
         grid_ymax = y[dim[1]-1],
         grid_zmin = z[0],
         grid_zmax = z[dim[2]-1];

  if      ( (grid_xmin > body->xmin) && (grid_xmax < body->xmax) ) strcpy(IB->mode,_IB_YZ_);
  else if ( (grid_ymin > body->ymin) && (grid_ymax < body->ymax) ) strcpy(IB->mode,_IB_XZ_);
  else if ( (grid_zmin > body->zmin) && (grid_zmax < body->zmax) ) strcpy(IB->mode,_IB_XY_);
  else                                                             strcpy(IB->mode,_IB_3D_);

  return(0);
}