protected override double RunSolverOneStep(int TimestepNo, double phystime, double dt)
{
base.EndTime = 0.0;
base.NoOfTimesteps = 0;
// Flux Derivatives
// =================
{
// compute
df1_dx_Numerical.Clear();
df1_dx_Numerical.DerivativeByFlux(1.0, f1, 0);
df1_dy_Numerical.DerivativeByFlux(1.0, f1, 1);
Console.WriteLine("Local Derivatives: ");
// print diagnostic:
df1_dx_Analytical.Acc(-1.0, df1_dx_Numerical);
df1_dy_Analytical.Acc(-1.0, df1_dy_Numerical);
double err_dx = df1_dx_Analytical.L2Norm();
Console.WriteLine("|| df/dx_Numerical - df/dx_Analytical ||_2 = " + err_dx);
passed = passed && (err_dx < 1.0e-10);
double err_dy = df1_dy_Analytical.L2Norm();
Console.WriteLine("|| df/dy_Numerical - df/dy_Analytical ||_2 = " + err_dy);
passed = passed && (err_dy < 1.0e-10);
Console.WriteLine("--------------------------------------------");
}
//PlotCurrentState(0, 0);
//OrthonormalityTest();
//PlotCell0();
return(0.0); // return some artificial timestep
}
/// <summary>
/// performs some timesteps
/// </summary>
protected override double RunSolverOneStep(int TimestepNo, double phystime, double dt)
{
using (new FuncTrace()) {
/*
* u.ProjectField((x, y, z) => (x*x*3));
*
* //dx_u.Derivative(1.0, u, 0);
* //dy_u.Derivative(1.0, u, 1);
*
* dx_u_byflux.DerivativeByFlux(1.0, u, 0);
* //dy_u_byflux.DerivativeByFlux(1.0, u, 1);
*
* double min, max;
* dx_u_byflux.GetExtremalValues(out min, out max);
* Console.WriteLine(min + " < dx_u_byflux < " + max);
*
* base.TerminationKey = true;
*
* base.NoOfTimesteps = -1;
* return dt;
*
*/
ScalarFunction sf = ((_2D)((x, y) => 1 - x * x - y * y)).Vectorize();
u.ProjectField(sf);
var err = u.L2Error(sf, 4);
double min_x, max_x, min_y, max_y, min_u, max_u;
dx_u_byflux.GetExtremalValues(out min_x, out max_x);
dy_u_byflux.GetExtremalValues(out min_y, out max_y);
u.GetExtremalValues(out min_u, out max_u);
Console.WriteLine(min_u + " < u < " + max_u);
Console.WriteLine(min_x + " < dx_u_byflux < " + max_x);
Console.WriteLine(min_y + " < dy_u_byflux < " + max_y);
//double Apl, Ami;
//EvaluateLevelSetVolume(u, out Apl, out Ami);
if (dt <= 0)
{
// if dt <= 0, we're free to set the timestep on our own
//base.NoOfTimesteps = -1;
//dt = 1;
base.NoOfTimesteps = 1;
base.EndTime = Math.PI / 200.0;
dt = base.EndTime / ((double)base.NoOfTimesteps);
base.NoOfTimesteps *= 1; // run till' infinity
base.EndTime = 1.0e20;
}
if (base.GridDat.MyRank == 0)
{
Console.Write("Timestp. #" + TimestepNo + " of " + base.NoOfTimesteps + " ... \t");
}
//eEule.Perform(dt);
//if ((TimestepNo) % 1 == 0)
// PlotCurrentState(phystime, (int)TimestepNo);
if (base.GridDat.MyRank == 0)
{
Console.WriteLine("finished!");
}
// print diagnostic:
if (TimestepNo == 1)
{
du_dx_Analytical.Acc(-1.0, dx_u_byflux);
du_dy_Analytical.Acc(-1.0, dy_u_byflux);
double err_dx = du_dx_Analytical.L2Norm();
Console.WriteLine("|| df/dx_Numerical - df/dx_Analytical ||_2 = " + err_dx);
double err_dy = du_dy_Analytical.L2Norm();
Console.WriteLine("|| df/dy_Numerical - df/dy_Analytical ||_2 = " + err_dy);
Console.WriteLine("--------------------------------------------");
}
return(dt);
}
}
