PETSc version 3.15.5
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# PetscDSGetRiemannSolver

Returns the Riemann solver for the given field

### Synopsis

    #include "petscds.h"
    PetscErrorCode PetscDSGetRiemannSolver(PetscDS ds, PetscInt f,
                                           void (**r)(PetscInt dim, PetscInt Nf, const PetscReal x[], const PetscReal n[], const PetscScalar uL[], const PetscScalar uR[], PetscInt numConstants, const PetscScalar constants[], PetscScalar flux[], void *ctx))

Not collective

### Input Arguments

| ds | - The PetscDS object
| f | - The field number

### Output Argument

| r | - Riemann solver

### Calling sequence for r

    r(PetscInt dim, PetscInt Nf, const PetscReal x[], const PetscReal n[], const PetscScalar uL[], const PetscScalar uR[], PetscScalar flux[], void *ctx)

| dim | - The spatial dimension
| Nf | - The number of fields
| x | - The coordinates at a point on the interface
| n | - The normal vector to the interface
| uL | - The state vector to the left of the interface
| uR | - The state vector to the right of the interface
| flux | - output array of flux through the interface
| numConstants | - number of constant parameters
| constants | - constant parameters
| ctx | - optional user context

### See Also

PetscDSSetRiemannSolver()

### Level

intermediate

### Location

src/dm/dt/interface/dtds.c
Index of all DT routines
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