Attenuate cylinder2d inflow velocity increase

1 files changed, 45 insertions, 44 deletions

diff --git a/apps/adrian/cylinder2d/cylinder2d.cpp b/apps/adrian/cylinder2d/cylinder2d.cpp
index 739c02c..33028c0 100644
--- a/apps/adrian/cylinder2d/cylinder2d.cpp
+++ b/apps/adrian/cylinder2d/cylinder2d.cpp
@@ -42,10 +42,7 @@ const T ly  = 2.0;            // height of the channel
 const int N = 100;            // resolution of the model
 const T Re  = 1000.;          // Reynolds number
 const T baseTau = 0.52;       // Relaxation time of coarsest grid
-const T maxPhysT = 60.;       // max. simulation time in s, SI unit
-const T physInterval = 0.25;  // interval for the convergence check in s
-const T residuum = 1e-5;      // residuum for the convergence check
-
+const T maxPhysT = 120.;      // max. simulation time in s, SI unit
 
 void prepareGeometry(Grid2D<T,DESCRIPTOR>& grid)
 {
@@ -83,10 +80,10 @@ void prepareGeometry(Grid2D<T,DESCRIPTOR>& grid)
     sGeometry.rename(1,4,outflow);
   }
 
-  // Set material number for vertically centered obstacle
+  // Set material number for vertically centered cylinder
   {
     const Vector<T,2> origin {1.25, ly/2};
-    IndicatorCircle2D<T> obstacle(origin, 0.15);
+    IndicatorCircle2D<T> obstacle(origin, 0.2);
     sGeometry.rename(1,2,obstacle);
   }
 
@@ -120,35 +117,50 @@ void prepareLattice(Grid2D<T,DESCRIPTOR>& grid,
   sBoundaryCondition.addVelocityBoundary(sGeometry, 3, omega);
   sBoundaryCondition.addPressureBoundary(sGeometry, 4, omega);
 
-  const T Lx = converter.getLatticeLength(lx);
-  const T Ly = converter.getLatticeLength(ly);
-  const T p0 = 8.*converter.getLatticeViscosity()*converter.getCharLatticeVelocity()*Lx/(Ly*Ly);
-  AnalyticalLinear2D<T,T> rho(-p0/lx*DESCRIPTOR<T>::invCs2, 0, p0*DESCRIPTOR<T>::invCs2+1);
-
-  const T maxVelocity = converter.getCharLatticeVelocity();
-  const T radius = ly/2;
-  std::vector<T> axisPoint{0, ly/2};
-  std::vector<T> axisDirection{1, 0};
-  Poiseuille2D<T> u(axisPoint, axisDirection, maxVelocity, radius);
-
-  sLattice.defineRhoU(sGeometry, 1, rho, u);
-  sLattice.iniEquilibrium(sGeometry, 1, rho, u);
-  sLattice.defineRhoU(sGeometry, 2, rho, u);
-  sLattice.iniEquilibrium(sGeometry, 2, rho, u);
+  AnalyticalConst2D<T,T> rho0(1.0);
+  AnalyticalConst2D<T,T> u0(0.0, 0.0);
 
-  sLattice.defineRhoU(sGeometry, 3, rho, u);
-  sLattice.iniEquilibrium(sGeometry, 3, rho, u);
-  sLattice.defineRhoU(sGeometry, 4, rho, u);
-  sLattice.iniEquilibrium(sGeometry, 4, rho, u);
+  auto materials = sGeometry.getMaterialIndicator({1, 3, 4});
+  sLattice.defineRhoU(materials, rho0, u0);
+  sLattice.iniEquilibrium(materials, rho0, u0);
 
   sLattice.initialize();
 
   clout << "Prepare lattice ... OK" << std::endl;
 }
 
+void setBoundaryValues(Grid2D<T,DESCRIPTOR>& grid, int iT)
+{
+  auto& converter = grid.getConverter();
+  auto& sGeometry = grid.getSuperGeometry();
+  auto& sLattice  = grid.getSuperLattice();
+
+  const int iTmaxStart = converter.getLatticeTime(0.1 * maxPhysT);
+  const int iTupdate = 50;
+
+  if ( iT % iTupdate == 0 && iT <= iTmaxStart ) {
+    OstreamManager clout(std::cout,"setBoundaryValues");
+    clout << "Update inflow." << std::endl;
+
+    PolynomialStartScale<T,T> StartScale(iTmaxStart, 1.0);
+
+    T iTvec[1] { T(iT) };
+    T frac[1] { };
+    StartScale(frac, iTvec);
+
+    const T maxVelocity = converter.getCharLatticeVelocity() * frac[0];
+    const T radius = ly/2;
+    std::vector<T> axisPoint{0, ly/2};
+    std::vector<T> axisDirection{1, 0};
+    Poiseuille2D<T> u(axisPoint, axisDirection, maxVelocity, radius);
+
+    sLattice.defineU(sGeometry, 3, u);
+  }
+}
+
 void getResults(const std::string& prefix,
                 Grid2D<T,DESCRIPTOR>& grid,
-                int iT, Timer<T>& timer, bool hasConverged)
+                int iT, Timer<T>& timer)
 {
   OstreamManager clout(std::cout,"getResults");
 
@@ -174,7 +186,7 @@ void getResults(const std::string& prefix,
     vtmWriter.write(iT);
   }
 
-  if (iT%statIter==0 || hasConverged) {
+  if (iT%statIter==0 ) {
     timer.update(iT);
     timer.printStep();
 
@@ -221,7 +233,7 @@ int main(int argc, char* argv[])
   sOnLatticeBoundaryCondition2D<T, DESCRIPTOR> fineSBoundaryCondition(fineGrid.getSuperLattice());
   createLocalBoundaryCondition2D<T, DESCRIPTOR>(fineSBoundaryCondition);
 
-  const Vector<T,2> fineExtend2 {0.8, 0.6};
+  const Vector<T,2> fineExtend2 {1.2, 0.8};
   const Vector<T,2> fineOrigin2 {0.95, (ly-fineExtend2[1])/2};
 
   auto& fineGrid2 = fineGrid.refine(fineOrigin2, fineExtend2);
@@ -242,20 +254,14 @@ int main(int argc, char* argv[])
 
   prepareLattice(fineGrid2, fineBulkDynamics2, fineSBoundaryCondition2);
 
-  clout << "starting simulation..." << endl;
+  clout << "Starting simulation..." << endl;
   Timer<T> timer(
     coarseGrid.getConverter().getLatticeTime(maxPhysT),
     coarseGrid.getSuperGeometry().getStatistics().getNvoxel());
-  util::ValueTracer<T> converge(
-    fineGrid2.getConverter().getLatticeTime(physInterval),
-    residuum);
   timer.start();
 
   for (int iT = 0; iT < coarseGrid.getConverter().getLatticeTime(maxPhysT); ++iT) {
-    if (converge.hasConverged()) {
-      clout << "Simulation converged." << endl;
-      break;
-    }
+    setBoundaryValues(coarseGrid, iT);
 
     coarseGrid.collideAndStream();
 
@@ -263,22 +269,17 @@ int main(int argc, char* argv[])
       "coarse_",
       coarseGrid,
       iT,
-      timer,
-      converge.hasConverged());
+      timer);
     getResults(
       "fine_",
       fineGrid,
       iT,
-      timer,
-      converge.hasConverged());
+      timer);
     getResults(
       "fine2_",
       fineGrid2,
       iT,
-      timer,
-      converge.hasConverged());
-
-    converge.takeValue(fineGrid2.getSuperLattice().getStatistics().getAverageEnergy(), true);
+      timer);
   }
 
   timer.stop();