From 69f40a510a39ba561d290ad07ccbd3f0c3786a7c Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 16 Jan 2019 15:40:01 +0100
Subject: Restore original bisected poiseuille flow refinement test case

---
 apps/adrian/poiseuille2d/poiseuille2d.cpp | 34 +++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 11 deletions(-)

diff --git a/apps/adrian/poiseuille2d/poiseuille2d.cpp b/apps/adrian/poiseuille2d/poiseuille2d.cpp
index b6c2f52..d92934b 100644
--- a/apps/adrian/poiseuille2d/poiseuille2d.cpp
+++ b/apps/adrian/poiseuille2d/poiseuille2d.cpp
@@ -1,8 +1,8 @@
-/*  Lattice Boltzmann sample, written in C++, using the OpenLB
- *  library
+/*
+ *  Lattice Boltzmann grid refinement sample, written in C++,
+ *  using the OpenLB library
  *
- *  Copyright (C) 2007, 2012 Jonas Latt, Mathias J. Krause
- *  Vojtech Cvrcek, Peter Weisbrod
+ *  Copyright (C) 2019 Adrian Kummerländer
  *  E-mail contact: info@openlb.net
  *  The most recent release of OpenLB can be downloaded at
  *  <http://www.openlb.net/>
@@ -31,15 +31,14 @@
 #include <vector>
 
 using namespace olb;
-using namespace olb::descriptors;
 
 typedef double T;
 
-#define DESCRIPTOR D2Q9Descriptor
+#define DESCRIPTOR descriptors::D2Q9Descriptor
 
 const T lx  = 4.0;            // length of the channel
 const T ly  = 1.0;            // height of the channel
-const int N = 50;             // resolution of the model
+const int N = 30;             // resolution of the model
 const T Re  = 100.;           // Reynolds number
 const T baseTau = 0.8;        // Relaxation time of coarsest grid
 const T maxPhysT = 60.;       // max. simulation time in s, SI unit
@@ -182,16 +181,29 @@ int main(int argc, char* argv[])
   OstreamManager clout(std::cout,"main");
 
   const Vector<T,2> coarseOrigin {0.0, 0.0};
-  const Vector<T,2> coarseExtend {lx, ly};
+  const Vector<T,2> coarseExtend {lx/2, ly};
   IndicatorCuboid2D<T> coarseCuboid(coarseExtend, coarseOrigin);
 
   Grid2D<T,DESCRIPTOR> coarseGrid(coarseCuboid, N, baseTau, Re);
   prepareGeometry(coarseGrid);
 
-  const Vector<T,2> fineExtend {2.0, 0.5};
-  const Vector<T,2> fineOrigin {1.0, (ly-fineExtend[1])/2};
+  const T coarseDeltaX = coarseGrid.getConverter().getPhysDeltaX();
+
+  const Vector<T,2> fineExtend {lx/2+coarseDeltaX, ly};
+  const Vector<T,2> fineOrigin {lx/2-coarseDeltaX, 0.0};
+
+  auto& fineGrid = coarseGrid.refine(fineOrigin, fineExtend, false);
+
+  {
+    const Vector<T,2> origin = fineGrid.getOrigin();
+    const Vector<T,2> extend = fineGrid.getExtend();
+
+    const Vector<T,2> extendY = {0,extend[1]};
+
+    coarseGrid.addFineCoupling(fineGrid, origin, extendY);
+    coarseGrid.addCoarseCoupling(fineGrid, origin + Vector<T,2>{coarseDeltaX,0}, extendY);
+  }
 
-  auto& fineGrid = coarseGrid.refine(fineOrigin, fineExtend);
   prepareGeometry(fineGrid);
 
   auto refinedOverlap = fineGrid.getRefinedOverlap();
-- 
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