udfGetEbcCovar()
Return the surface covariant at the surface quadrature point.
Syntax
covar = udfGetEbcCovar( udfHd ) ;
Type
AcuSolve User-Defined Example Boundary Condition
Parameters
- udfHd
- The opaque handle (pointer) which was passed to the user function.
Return Value
- covar (Real*)
- Pointer to two dimensional real array of the covariant. The first (fastest) dimension of the array is the number of surfaces, nItems, and the second (slower) dimension is six, for the xx, yy, zz, xy, yz and zx components.
Description
This routine returns the surface covariant at the surface quadrature point. The surface covariant
is given by(1)
where 
is the local parent
element coordinate (with being normal to the surface) and 
is the global coordinate.
The latter is for the current (deformed) configuration if mesh displacement is active. For
example,
is the local parent
element coordinate (with being normal to the surface) and is the global coordinate.
The latter is for the current (deformed) configuration if mesh displacement is active. For
example,Real* covar ;
Real xx_covar, yy_covar, zz_covar ;
Real xy_covar, yz_covar, zx_covar ;
Integer surf ;
...
covar = udfGetEbcCovar( udfHd ) ;
for ( surf = 0 ; surf < nItems ; surf++ ) {
xx_covar = covar[0*nItems+surf] ;
yy_covar = covar[1*nItems+surf] ;
zz_covar = covar[2*nItems+surf] ;
xy_covar = covar[3*nItems+surf] ;
yz_covar = covar[4*nItems+surf] ;
zx_covar = covar[5*nItems+surf] ;
...
}Errors
- This routine expects a valid udfHd.
- This routine may only be called within an Element Boundary Condition user function.