JIANG/EPANET
1
0
Fork 0
Code Issues Pull Requests Actions 4 Packages Projects Releases Wiki Activity
Files
82055f24a9ec6b6088c53188cdc89cee0bf5f783
EPANET/src/hydstatus.c
Lew Rossman 9a540cc0f4 Code cleanup 
1. Added a standard header to each code module and removed obsolete comments.
2. Re-named several of the sub-structs in the project struct and re-arranged some of their contents.
3. Re-named _defaultModel to _defaultProject.
4. Removed the need to call EN_createproject and EN_deleteproject when working with the default project.
5. Made X & Y coords. part of Snode properties instead of a separate struct.
6. Moved the non-API functions in epanet.c into a new module named project.c.
7. Re-factored the quality module so that it uses the same nodal adjacency lists as the hydraulics solver.
8. Re-factored the sparse matrix module (smatrix.c) to be more memory efficient.
9. Restricted line lengths to < 90 columns.
10. Grouped the placement of functions in EPANET2.H and EPANET.C by category.
2018-11-27 14:22:06 -05:00

475 lines
14 KiB
C
Raw Blame History

/*
******************************************************************************
Project: OWA EPANET
Version: 2.2
Module: hydstatus.c
Description: updates hydraulic status of network elements
Authors: see AUTHORS
Copyright: see AUTHORS
License: see LICENSE
Last Updated: 11/27/2018
******************************************************************************
*/
#include <stdio.h>
#include "types.h"
#include "funcs.h"
// Exported functions
int valvestatus(Project *);
int linkstatus(Project *);
// Local functions
static StatusType cvstatus(Project *, StatusType, double, double);
static StatusType pumpstatus(Project *, int, double);
static StatusType prvstatus(Project *, int, StatusType, double, double, double);
static StatusType psvstatus(Project *, int, StatusType, double, double, double);
static StatusType fcvstatus(Project *, int, StatusType, double, double);
static void tankstatus(Project *, int, int, int);
int valvestatus(Project *pr)
/*
**-----------------------------------------------------------------
** Input: none
** Output: returns 1 if any pressure or flow control valve
** changes status, 0 otherwise
** Purpose: updates status for PRVs & PSVs whose status
** is not fixed to OPEN/CLOSED
**-----------------------------------------------------------------
*/
{
Network *net = &pr->network;
Hydraul *hyd = &pr->hydraul;
Report *rpt = &pr->report;
int change = FALSE, // Status change flag
i, k, // Valve & link indexes
n1, n2; // Start & end nodes
double hset; // Valve head setting
StatusType status; // Valve status settings
Slink *link;
// Examine each valve
for (i = 1; i <= net->Nvalves; i++)
{
// Get valve's link and its index
k = net->Valve[i].Link;
link = &net->Link[k];
// Ignore valve if its status is fixed to OPEN/CLOSED
if (hyd->LinkSetting[k] == MISSING) continue;
// Get start/end node indexes & save current status
n1 = link->N1;
n2 = link->N2;
status = hyd->LinkStatus[k];
// Evaluate valve's new status
switch (link->Type)
{
case PRV:
hset = net->Node[n2].El + hyd->LinkSetting[k];
hyd->LinkStatus[k] = prvstatus(pr, k, status, hset,
hyd->NodeHead[n1], hyd->NodeHead[n2]);
break;
case PSV:
hset = net->Node[n1].El + hyd->LinkSetting[k];
hyd->LinkStatus[k] = psvstatus(pr, k, status, hset,
hyd->NodeHead[n1], hyd->NodeHead[n2]);
break;
default:
continue;
}
// Check for a status change
if (status != hyd->LinkStatus[k])
{
if (rpt->Statflag == FULL)
{
writestatchange(pr, k, status, hyd->LinkStatus[k]);
}
change = TRUE;
}
}
return change;
}
int linkstatus(Project *pr)
/*
**--------------------------------------------------------------
** Input: none
** Output: returns 1 if any link changes status, 0 otherwise
** Purpose: determines new status for pumps, CVs, FCVs & pipes
** to tanks.
**--------------------------------------------------------------
*/
{
Network *net = &pr->network;
Hydraul *hyd = &pr->hydraul;
Report *rpt = &pr->report;
int change = FALSE, // Status change flag
k, // Link index
n1, // Start node index
n2; // End node index
double dh; // Head difference across link
StatusType status; // Current status
Slink *link;
// Examine each link
for (k = 1; k <= net->Nlinks; k++)
{
link = &net->Link[k];
n1 = link->N1;
n2 = link->N2;
dh = hyd->NodeHead[n1] - hyd->NodeHead[n2];
// Re-open temporarily closed links (status = XHEAD or TEMPCLOSED)
status = hyd->LinkStatus[k];
if (status == XHEAD || status == TEMPCLOSED)
{
hyd->LinkStatus[k] = OPEN;
}
// Check for status changes in CVs and pumps
if (link->Type == CVPIPE)
{
hyd->LinkStatus[k] = cvstatus(pr, hyd->LinkStatus[k], dh,
hyd->LinkFlow[k]);
}
if (link->Type == PUMP && hyd->LinkStatus[k] >= OPEN &&
hyd->LinkSetting[k] > 0.0)
{
hyd->LinkStatus[k] = pumpstatus(pr, k, -dh);
}
// Check for status changes in non-fixed FCVs
if (link->Type == FCV && hyd->LinkSetting[k] != MISSING)
{
hyd->LinkStatus[k] = fcvstatus(pr, k, status, hyd->NodeHead[n1],
hyd->NodeHead[n2]);
}
// Check for flow into (out of) full (empty) tanks
if (n1 > net->Njuncs || n2 > net->Njuncs)
{
tankstatus(pr, k, n1, n2);
}
// Note any change in link status; do not revise link flow
if (status != hyd->LinkStatus[k])
{
change = TRUE;
if (rpt->Statflag == FULL)
{
writestatchange(pr, k, status, hyd->LinkStatus[k]);
}
}
}
return change;
}
StatusType cvstatus(Project *pr, StatusType s, double dh, double q)
/*
**--------------------------------------------------
** Input: s = current link status
** dh = head loss across link
** q = link flow
** Output: returns new link status
** Purpose: updates status of a check valve link.
**--------------------------------------------------
*/
{
Hydraul *hyd = &pr->hydraul;
// Prevent reverse flow through CVs
if (ABS(dh) > hyd->Htol)
{
if (dh < -hyd->Htol) return CLOSED;
else if (q < -hyd->Qtol) return CLOSED;
else return OPEN;
}
else
{
if (q < -hyd->Qtol) return CLOSED;
else return s;
}
}
StatusType pumpstatus(Project *pr, int k, double dh)
/*
**--------------------------------------------------
** Input: k = link index
** dh = head gain across link
** Output: returns new pump status
** Purpose: updates status of an open pump.
**--------------------------------------------------
*/
{
Hydraul *hyd = &pr->hydraul;
Network *net = &pr->network;
int p;
double hmax;
// Find maximum head (hmax) pump can deliver
p = findpump(net, k);
if (net->Pump[p].Ptype == CONST_HP)
{
// Use huge value for constant HP pump
hmax = BIG;
}
else
{
// Use speed-adjusted shut-off head for other pumps
hmax = SQR(hyd->LinkSetting[k]) * net->Pump[p].Hmax;
}
// Check if currrent head gain exceeds pump's max. head
if (dh > hmax + hyd->Htol) return XHEAD;
// No check is made to see if flow exceeds pump's max. flow
return OPEN;
}
StatusType prvstatus(Project *pr, int k, StatusType s, double hset,
double h1, double h2)
/*
**-----------------------------------------------------------
** Input: k = link index
** s = current status
** hset = valve head setting
** h1 = head at upstream node
** h2 = head at downstream node
** Output: returns new valve status
** Purpose: updates status of a pressure reducing valve.
**-----------------------------------------------------------
*/
{
Hydraul *hyd = &pr->hydraul;
StatusType status; // Valve's new status
double hml; // Head loss when fully opened
double htol;
Slink *link;
htol = hyd->Htol;
link = &pr->network.Link[k];
// Head loss when fully open
hml = link->Km * SQR(hyd->LinkFlow[k]);
// Rules for updating valve's status from current value s
status = s;
switch (s)
{
case ACTIVE:
if (hyd->LinkFlow[k] < -hyd->Qtol) status = CLOSED;
else if (h1 - hml < hset - htol) status = OPEN;
else status = ACTIVE;
break;
case OPEN:
if (hyd->LinkFlow[k] < -hyd->Qtol) status = CLOSED;
else if (h2 >= hset + htol) status = ACTIVE;
else status = OPEN;
break;
case CLOSED:
if (h1 >= hset + htol && h2 < hset - htol) status = ACTIVE;
else if (h1 < hset - htol && h1 > h2 + htol) status = OPEN;
else status = CLOSED;
break;
case XPRESSURE:
if (hyd->LinkFlow[k] < -hyd->Qtol) status = CLOSED;
break;
default:
break;
}
return status;
}
StatusType psvstatus(Project *pr, int k, StatusType s, double hset,
double h1, double h2)
/*
**-----------------------------------------------------------
** Input: k = link index
** s = current status
** hset = valve head setting
** h1 = head at upstream node
** h2 = head at downstream node
** Output: returns new valve status
** Purpose: updates status of a pressure sustaining valve.
**-----------------------------------------------------------
*/
{
Hydraul *hyd = &pr->hydraul;
StatusType status; // Valve's new status
double hml; // Head loss when fully opened
double htol;
Slink *link;
htol = hyd->Htol;
link = &pr->network.Link[k];
// Head loss when fully open
hml = link->Km * SQR(hyd->LinkFlow[k]);
// Rules for updating valve's status from current value s
status = s;
switch (s)
{
case ACTIVE:
if (hyd->LinkFlow[k] < -hyd->Qtol) status = CLOSED;
else if (h2 + hml > hset + htol) status = OPEN;
else status = ACTIVE;
break;
case OPEN:
if (hyd->LinkFlow[k] < -hyd->Qtol) status = CLOSED;
else if (h1 < hset - htol) status = ACTIVE;
else status = OPEN;
break;
case CLOSED:
if (h2 > hset + htol && h1 > h2 + htol) status = OPEN;
else if (h1 >= hset + htol && h1 > h2 + htol) status = ACTIVE;
else status = CLOSED;
break;
case XPRESSURE:
if (hyd->LinkFlow[k] < -hyd->Qtol) status = CLOSED;
break;
default:
break;
}
return status;
}
StatusType fcvstatus(Project *pr, int k, StatusType s, double h1, double h2)
/*
**-----------------------------------------------------------
** Input: k = link index
** s = current status
** h1 = head at upstream node
** h2 = head at downstream node
** Output: returns new valve status
** Purpose: updates status of a flow control valve.
**
** Valve status changes to XFCV if flow reversal.
** If current status is XFCV and current flow is
** above setting, then valve becomes active.
** If current status is XFCV, and current flow
** positive but still below valve setting, then
** status remains same.
**-----------------------------------------------------------
*/
{
Hydraul *hyd = &pr->hydraul;
StatusType status; // New valve status
status = s;
if (h1 - h2 < -hyd->Htol)
{
status = XFCV;
}
else if (hyd->LinkFlow[k] < -hyd->Qtol)
{
status = XFCV;
}
else if (s == XFCV && hyd->LinkFlow[k] >= hyd->LinkSetting[k])
{
status = ACTIVE;
}
return status;
}
void tankstatus(Project *pr, int k, int n1, int n2)
/*
**----------------------------------------------------------------
** Input: k = link index
** n1 = start node of link
** n2 = end node of link
** Output: none
** Purpose: closes link flowing into full or out of empty tank
**----------------------------------------------------------------
*/
{
Network *net = &pr->network;
Hydraul *hyd = &pr->hydraul;
int i, n;
double h, q;
Stank *tank;
Slink *link = &net->Link[k];
// Return if link is closed
if (hyd->LinkStatus[k] <= CLOSED) return;
// Make node n1 be the tank, reversing flow (q) if need be
q = hyd->LinkFlow[k];
i = n1 - net->Njuncs;
if (i <= 0)
{
i = n2 - net->Njuncs;
if (i <= 0) return;
n = n1;
n1 = n2;
n2 = n;
q = -q;
}
// Ignore reservoirs
tank = &net->Tank[i];
if (tank->A == 0.0) return;
// Find head difference across link
h = hyd->NodeHead[n1] - hyd->NodeHead[n2];
// If tank is full, then prevent flow into it
if (hyd->NodeHead[n1] >= tank->Hmax - hyd->Htol)
{
// Case 1: Link is a pump discharging into tank
if (link->Type == PUMP)
{
if (link->N2 == n1) hyd->LinkStatus[k] = TEMPCLOSED;
}
// Case 2: Downstream head > tank head
// (e.g., an open outflow check valve would close)
else if (cvstatus(pr, OPEN, h, q) == CLOSED)
{
hyd->LinkStatus[k] = TEMPCLOSED;
}
}
// If tank is empty, then prevent flow out of it
if (hyd->NodeHead[n1] <= tank->Hmin + hyd->Htol)
{
// Case 1: Link is a pump discharging from tank
if (link->Type == PUMP)
{
if (link->N1 == n1) hyd->LinkStatus[k] = TEMPCLOSED;
}
// Case 2: Tank head > downstream head
// (e.g., a closed outflow check valve would open)
else if (cvstatus(pr, CLOSED, h, q) == OPEN)
{
hyd->LinkStatus[k] = TEMPCLOSED;
}
}
}
Reference in New Issue View Git Blame Copy Permalink