internal double[] calculateDyDt(double[] vols, double[] forcing)
{
//System.Array.Clear(dydt,0,lengthOfStateVector);
double[] tempDyDt = new double[lengthOfStateVector];
for (int i = 0; i < vols.Length; i++) //MB: Constraining to volumes above or equal to zero.
{
if (vols[i] < 0)
{
vols[i] = 0;
}
}
foreach (Connection con in connections)
{
try
{
int j = con.from;
double x = con.calculateFlow(vols);
tempDyDt[j] -= x;
if (con.to != System.Int32.MaxValue) //outlets are given MaxValue as magic number.
{
tempDyDt[con.to] += x;
}
}
catch (Exception ex1)
{
Exception ex2 = new Exception("Time t=: " + t + " Error calculating flow: " + nodes[con.from].name + " to " + nodes[con.to].name + " vol in from node=" + vols[con.from], ex1);
throw ex2;
}
}
tempDyDt = RungeKutta4.arrSum(tempDyDt, forcing);
return(tempDyDt);
}
internal double[] calculateDyDt(double[] vols, double[] forcing)
{
//System.Array.Clear(dydt,0,lengthOfStateVector);
double[] tempDyDt = new double[lengthOfStateVector];
for (int i = 0; i < vols.Length; i++) //MB: Constraining to volumes above or equal to zero.
{
if (vols[i] < 0)
{
vols[i] = 0;
}
}
for (int i = 0; i < qSplits.Length; i++)
{
qSplits[i] = 0;
qMassSplits[i] = 0;
}
foreach (Connection con in connections)
{
try
{
if (!con.bFromFlowDivider)
{
double q = con.calculateFlow(vols);
tempDyDt[con.from] -= q;
double qMass = 0;
if (bIncludeWQ)
{
if (vols[con.from] < virtuallyZero)
{
qMass = 0;
}
else
{
qMass = q * vols[con.from + NhydraulicStates] / vols[con.from]; //mass flux calculated as flow times mass / volume;
}
tempDyDt[con.from + NhydraulicStates] -= qMass;
}
if (con.bToFlowDivider)
{
this.qSplits[con.to] += q; //add flow to the right flow divider.
if (bIncludeWQ)
{
this.qMassSplits[con.to] += qMass;
}
}
else
{
if (con.to != System.Int32.MaxValue) //outlets are given MaxValue as magic number.
{
tempDyDt[con.to] += q;
if (bIncludeWQ)
{
tempDyDt[con.to + NhydraulicStates] += qMass;
}
}
}
if (con.bIsOutput)
{
con.accumFlow(q); //for calculating output flow as avereage of all solver steps.
if (bIncludeWQ)
{
con.accumMassFlux(qMass);
}
}
}
}
catch (Exception ex1)
{
Exception ex2 = new Exception("Time t=: " + t + " Error calculating flow: " + nodes[con.from].name + " to " + nodes[con.to].name + " vol in from node=" + vols[con.from], ex1);
throw ex2;
}
}
foreach (FlowDivider fd in flowDividers)
{
//if (bIncludeWQ) throw new NotImplementedException("WQ not implemented for flow dividers yet");
int Ncons = fd.connections.Count;
double[] qs = new double[Ncons];
int[] stateVectorIndexes = new int[Ncons];
int i = 0;
foreach (FlowDividerConnection con in fd.connections)
{ //calculate flow from all flow dividers. The flow to has been calculated above.
qs[i] = con.calculateFlow(qSplits);
if (con.to != System.Int32.MaxValue) //outlets are given MaxValue as magic number.
{
tempDyDt[con.to] += qs[i];
stateVectorIndexes[i] = con.to;
}
if (con.bIsOutput)
{
con.accumFlow(qs[i]); //for calculating output flow as avereage of all solver steps.
}
i++;
}
if (bIncludeWQ)
{
double sumx = qs.Sum();//total flow from divider.
double qMassInTotal = qMassSplits[fd.index] + fd.qMassFixed;
for (int j = 0; j < Ncons; j++)
{
double qMassx;
if (sumx < virtuallyZero)
{
qMassx = 0;
}
else
{
qMassx = qMassInTotal * qs[j] / sumx;
}
tempDyDt[stateVectorIndexes[j] + NhydraulicStates] += qMassx;
if (fd.connections[j].bIsOutput)
{
fd.connections[j].accumMassFlux(qMassx);
}
}
}
}
tempDyDt = RungeKutta4.arrSum(tempDyDt, forcing);
return(tempDyDt);
}