/**
Given input left and right states in a direction, a_dir, compute a
Riemann problem and generate fluxes at the faces within a_box.
*/
void LinElastPhysics::riemann(/// face-centered solution to Riemann problem
FArrayBox& a_WStar,
/// left state, on cells to left of each face
const FArrayBox& a_WLeft,
/// right state, on cells to right of each face
const FArrayBox& a_WRight,
/// state on cells, used to set boundary conditions
const FArrayBox& a_W,
/// current time
const Real& a_time,
/// direction of faces
const int& a_dir,
/// face-centered box on which to set a_WStar
const Box& a_box)
{
//JK pout() << "LinElastPhysics::riemann" << endl;
CH_assert(isDefined());
CH_assert(a_WStar.box().contains(a_box));
// Get the numbers of relevant variables
int numPrim = numPrimitives();
CH_assert(a_WStar .nComp() == numPrim);
CH_assert(a_WLeft .nComp() == numPrim);
CH_assert(a_WRight.nComp() == numPrim);
// Cast away "const" inputs so their boxes can be shifted left or right
// 1/2 cell and then back again (no net change is made!)
FArrayBox& shiftWLeft = (FArrayBox&)a_WLeft;
FArrayBox& shiftWRight = (FArrayBox&)a_WRight;
// Solution to the Riemann problem
// Shift the left and right primitive variable boxes 1/2 cell so they are
// face centered
shiftWLeft .shiftHalf(a_dir, 1);
shiftWRight.shiftHalf(a_dir,-1);
CH_assert(shiftWLeft .box().contains(a_box));
CH_assert(shiftWRight.box().contains(a_box));
// Riemann solver computes Wgdnv all edges that are not on the physical
// boundary.
FORT_RIEMANNF(CHF_FRA(a_WStar),
CHF_CONST_FRA(shiftWLeft),
CHF_CONST_FRA(shiftWRight),
CHF_CONST_INT(a_dir),
CHF_BOX(a_box));
// Call boundary Riemann solver (note: periodic BC's are handled there).
m_bc->primBC(a_WStar,shiftWLeft ,a_W,a_dir,Side::Hi,a_time);
m_bc->primBC(a_WStar,shiftWRight,a_W,a_dir,Side::Lo,a_time);
// Shift the left and right primitive variable boxes back to their original
// position.
shiftWLeft .shiftHalf(a_dir,-1);
shiftWRight.shiftHalf(a_dir, 1);
}
// Compute a Riemann problem and generate fluxes at the faces.
void PolytropicPhysics::riemann(FArrayBox& a_WGdnv,
const FArrayBox& a_WLeft,
const FArrayBox& a_WRight,
const FArrayBox& a_W,
const Real& a_time,
const int& a_dir,
const Box& a_box)
{
CH_assert(isDefined());
CH_assert(a_WGdnv.box().contains(a_box));
// Get the numbers of relevant variables
int numPrim = numPrimitives();
CH_assert(a_WGdnv .nComp() == numPrim);
CH_assert(a_WLeft .nComp() == numPrim);
CH_assert(a_WRight.nComp() == numPrim);
// Cast away "const" inputs so their boxes can be shifted left or right
// 1/2 cell and then back again (no net change is made!)
FArrayBox& shiftWLeft = (FArrayBox&)a_WLeft;
FArrayBox& shiftWRight = (FArrayBox&)a_WRight;
// Solution to the Riemann problem
// Shift the left and right primitive variable boxes 1/2 cell so they are
// face centered
shiftWLeft .shiftHalf(a_dir, 1);
shiftWRight.shiftHalf(a_dir,-1);
CH_assert(shiftWLeft .box().contains(a_box));
CH_assert(shiftWRight.box().contains(a_box));
// Riemann solver computes Wgdnv all edges that are not on the physical
// boundary.
FORT_RIEMANNF(CHF_FRA(a_WGdnv),
CHF_CONST_FRA(shiftWLeft),
CHF_CONST_FRA(shiftWRight),
CHF_CONST_INT(a_dir),
CHF_BOX(a_box));
// Call boundary Riemann solver (note: periodic BC's are handled there).
m_bc->primBC(a_WGdnv,shiftWLeft ,a_W,a_dir,Side::Hi,a_time);
m_bc->primBC(a_WGdnv,shiftWRight,a_W,a_dir,Side::Lo,a_time);
// Shift the left and right primitive variable boxes back to their original
// position.
shiftWLeft .shiftHalf(a_dir,-1);
shiftWRight.shiftHalf(a_dir, 1);
}