From 9248f0c5bff6ba04a838ebe94a4a4e925d38530e Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Fri, 1 Feb 2019 14:31:01 +0100
Subject: Report pressure drop and lift of refined cylinder

---
 apps/adrian/cylinder2d/cylinder2d.cpp | 37 +++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/apps/adrian/cylinder2d/cylinder2d.cpp b/apps/adrian/cylinder2d/cylinder2d.cpp
index b2ed6fc..094e548 100644
--- a/apps/adrian/cylinder2d/cylinder2d.cpp
+++ b/apps/adrian/cylinder2d/cylinder2d.cpp
@@ -206,6 +206,41 @@ void getResults(const std::string& prefix,
   }
 }
 
+void takeMeasurements(Grid2D<T,DESCRIPTOR>& grid)
+{
+  OstreamManager clout(std::cout,"measurement");
+
+  auto& sLattice  = grid.getSuperLattice();
+  auto& sGeometry = grid.getSuperGeometry();
+  auto& converter = grid.getConverter();
+
+  SuperLatticePhysPressure2D<T,DESCRIPTOR> pressure(sLattice, converter);
+  AnalyticalFfromSuperF2D<T> intpolatePressure(pressure, true);
+  SuperLatticePhysDrag2D<T,DESCRIPTOR> drag(sLattice, sGeometry, 5, converter);
+
+  const T centerCylinderX = 2*cylinderD;
+  const T centerCylinderY = 2*cylinderD;
+  const T radiusCylinder  = cylinderD/2;
+
+  const T point1[2] { centerCylinderX - radiusCylinder, centerCylinderY };
+  const T point2[2] { centerCylinderX + radiusCylinder, centerCylinderY };
+
+  T pressureInFrontOfCylinder, pressureBehindCylinder;
+  intpolatePressure(&pressureInFrontOfCylinder, point1);
+  intpolatePressure(&pressureBehindCylinder,    point2);
+
+  clout << "pressure1=" << pressureInFrontOfCylinder;
+  clout << "; pressure2=" << pressureBehindCylinder;
+
+  T pressureDrop = pressureInFrontOfCylinder - pressureBehindCylinder;
+  clout << "; pressureDrop=" << pressureDrop;
+
+  const int input[3] {};
+  T _drag[drag.getTargetDim()] {};
+  drag(_drag, input);
+  clout << "; drag=" << _drag[0] << "; lift=" << _drag[1] << endl;
+}
+
 int main(int argc, char* argv[])
 {
   olbInit(&argc, &argv);
@@ -297,6 +332,8 @@ int main(int argc, char* argv[])
       timer.printStep();
 
       coarseGrid.getSuperLattice().getStatistics().print(iT, coarseGrid.getConverter().getPhysTime(iT));
+
+      takeMeasurements(fineGrid3);
     }
   }
 
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