atl_ere_init Subroutine

public subroutine atl_ere_init(me, prim_left, prim_right, gam, tolerance, nMaxIter)

Compute the exact solution of the Riemann problem for the Euler equation.

For the given state in primitive variables left and right, the solution is computed and stored in me. A Newton-Raphson iteration is used to find the solution in this non-linear system. Necessary parameters besides left and right state are the isentropic coefficient gam, and optionally a target tolerance to reach in the iterative scheme and the maximal number of iterations to perform.

Arguments

Type	Intent	Optional	Attributes		Name
type(atl_ere_solState1D_type),	intent(out)			::	me	Description of the Riemann solution. If the input results in a critical state, me%critical will be set to true. nIter will contain the actual number of Newton-Raphson iterations, that were performed.
real(kind=rk),	intent(in)			::	prim_left(3)	Primitive variables left of discontinuity 1: density 2: velocity 3: pressure
real(kind=rk),	intent(in)			::	prim_right(3)	Primitive variables right of discontinuity
real(kind=rk),	intent(in)			::	gam	Isentropic expansion coefficient of the gas
real(kind=rk),	intent(in),	optional		::	tolerance	Tolerated variation in the Newton-Raphson iterations, default: 8 epsilon
integer,	intent(in),	optional		::	nMaxIter	Maximal number of iterations to do, default: 100000