1: #pragma once

  3: #define GRAV                9.806
  4: #define PIPE_CHARACTERISTIC 10000000.0

  6: #include <petsc.h>

  8: typedef struct {
  9:   PetscScalar q; /* flow rate */
 10:   PetscScalar h; /* pressure */
 11: } PipeField;

 13: typedef struct {
 14:   PetscScalar Q0, H0; /* boundary values in upstream */
 15:   PetscScalar QL, HL; /* boundary values in downstream */
 16: } PipeBoundary;

 18: /* pipe                 */
 19: /*----------------------*/
 20: struct _p_Pipe {
 21:   /* identification variables */
 22:   PetscInt id;
 23:   PetscInt networkid; /* which network this pipe belongs */

 25:   /* solver objects */
 26:   Vec        x;
 27:   PipeField *xold;
 28:   PetscReal  dt;
 29:   DM         da;
 30:   PetscInt   nnodes; /* number of nodes in da discretization */
 31:   Mat       *jacobian;

 33:   /* physics */
 34:   PetscReal    length; /* pipe length */
 35:   PetscReal    a;      /* natural flow speed */
 36:   PetscReal    fric;   /* friction */
 37:   PetscReal    D;      /* diameter */
 38:   PetscReal    A;      /* area of cross section */
 39:   PetscReal    R;
 40:   PetscReal    rad;
 41:   PipeBoundary boundary; /* boundary conditions for H and Q */
 42: } PETSC_ATTRIBUTEALIGNED(PetscMax(sizeof(double), sizeof(PetscScalar)));

 44: typedef struct _p_Pipe *Pipe;

 46: extern PetscErrorCode PipeCreate(MPI_Comm, Pipe *);
 47: extern PetscErrorCode PipeDestroy(Pipe *);
 48: extern PetscErrorCode PipeSetParameters(Pipe, PetscReal, PetscReal, PetscReal, PetscReal);
 49: extern PetscErrorCode PipeSetUp(Pipe);
 50: extern PetscErrorCode PipeCreateJacobian(Pipe, Mat *, Mat *[]);
 51: extern PetscErrorCode PipeDestroyJacobian(Pipe);

 53: extern PetscErrorCode PipeComputeSteadyState(Pipe, PetscScalar, PetscScalar);
 54: extern PetscErrorCode PipeIFunctionLocal(DMDALocalInfo *, PetscReal, PipeField *, PipeField *, PipeField *, Pipe);
 55: extern PetscErrorCode PipeIFunctionLocal_Lax(DMDALocalInfo *, PetscReal, PipeField *, PipeField *, PetscScalar *, Pipe);
 56: extern PetscErrorCode PipeRHSFunctionLocal(DMDALocalInfo *, PetscReal, PipeField *, PetscScalar *, Pipe);
 57: extern PetscErrorCode PipeMonitor(TS, PetscInt, PetscReal, Vec, void *);

 59: extern PetscErrorCode PipeCreateJacobian(Pipe, Mat *, Mat *[]);
 60: extern PetscErrorCode PipeDestroyJacobian(Pipe);