private double FunctionValueHalfTime(INonlinearModel model, int rowVid,
ValuesByIndex values, bool newValues)
{
foreach (Variable c in data.Variables)
{
if (c.ConstName == "T1/2")
{
c.ConstValue = values[model.GetIndexFromKey(c.ConstName)];
break;
}
}
double R = data.Variables[0].ConstValue;
double w = data.Variables[1].ConstValue;
double Kon = data.Variables[2].ConstValue;
double Koff = data.Variables[3].ConstValue;
double Df = data.Variables[4].ConstValue;
double Ceq = data.Variables[5].ConstValue;
double Feq = 1 - Ceq;
double Tht = data.Variables[6].ConstValue;
data.FitYVals = new double[data.XVals.Length];
Laplace lap = new Laplace();
lap.InitStehfest(14);
return(Math.Abs((R)*lap.InverseTransform(R, w, Feq, Ceq, Kon, Koff, Df, Tht) - 0.5 * R));
}
/// <summary>
/// The calculation Of the dimensionless wellbore pressure drop with skin for homogeneous reservoir.
/// </summary>
/// <param name="td">dimensionless time</param>
/// <param name="cd">dimensionless wellbore storage</param>
/// <param name="skinFactor">skin factor</param>
/// <returns></returns>
public static double PwdR(double td, double cd, double skinFactor)
{
Condition.Requires(td, nameof(td)).IsGreaterOrEqual(0.0);
Condition.Requires(cd, nameof(cd)).IsGreaterOrEqual(0.0);
return(Laplace.InverseTransform((x) => PwdRinLaplaceSpace(x, cd, skinFactor), td));
}
private static void SolveEq(DataSet data)
{
if (data.XVals.Length == 0 || data.Variables.Count == 0)
{
return;
}
double R = data.Variables[0].ConstValue;
double w = data.Variables[1].ConstValue;
double Kon = data.Variables[2].ConstValue;
double Koff = data.Variables[3].ConstValue;
double Df = data.Variables[4].ConstValue;
double Ceq = data.Variables[5].ConstValue;
double Feq = 1 - Ceq;
data.FitYVals = new double[data.XVals.Length];
Laplace lap = new Laplace();
lap.InitStehfest(14);
for (int t = 1; t < data.XVals.Length; t++)
{
//data.FitYVals[0][t] = MathNet.Numerics.SpecialFunctions.BesselK1(data.XVals[t]);
//data.YVals[0][t] = MathNet.Numerics.SpecialFunctions.BesselI1(data.XVals[t]);
//data.FitYVals[0][t] = Accord.Math.Bessel.I(data.XVals[t]);
//data.FitYVals[0][t] = Accord.Math.Bessel.Y(data.XVals[t]); - it is not modified!!!
data.FitYVals[t] = (R)*lap.InverseTransform(R, w, Feq, Ceq, Kon, Koff, Df, data.XVals[t]);
}
}
/// <summary>
/// Dimensionless wellbore pressure
/// </summary>
/// <param name="td">dimensionless time</param>
/// <returns></returns>
private double Pwd(double td)
{
return(Laplace.InverseTransform(PwdRinLaplaceSpace, td));
}
