From 94d3e79a8617f88dc0219cfdeedfa3147833719d Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Mon, 24 Jun 2019 14:43:36 +0200
Subject: Initialize at openlb-1-3

---
 src/boundary/momentaOnBoundaries2D.hh | 168 ++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 src/boundary/momentaOnBoundaries2D.hh

(limited to 'src/boundary/momentaOnBoundaries2D.hh')

diff --git a/src/boundary/momentaOnBoundaries2D.hh b/src/boundary/momentaOnBoundaries2D.hh
new file mode 100644
index 0000000..5b373fe
--- /dev/null
+++ b/src/boundary/momentaOnBoundaries2D.hh
@@ -0,0 +1,168 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2006, 2007 Jonas Latt
+ *  E-mail contact: info@openlb.net
+ *  The most recent release of OpenLB can be downloaded at
+ *  <http://www.openlb.net/>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public
+ *  License along with this program; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+*/
+
+/** \file
+ * Implementation of boundary cell dynamics -- generic implementation.
+ */
+#ifndef MOMENTA_ON_BOUNDARIES_2D_HH
+#define MOMENTA_ON_BOUNDARIES_2D_HH
+
+#include "momentaOnBoundaries2D.h"
+#include "dynamics/lbHelpers.h"
+#include "dynamics/firstOrderLbHelpers.h"
+
+namespace olb {
+
+////////////////////// Class InnerCornerVelBM2D ///////////////
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::InnerCornerVelBM2D()
+{
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    _u[iD] = T();
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::InnerCornerVelBM2D (
+  const T u_[DESCRIPTOR::d])
+{
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    _u[iD] = u_[iD];
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+T InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::computeRho (
+  Cell<T,DESCRIPTOR> const& cell ) const
+{
+  T rhoX = velocityBMRho<T, DESCRIPTOR, 0, normalX>(cell, _u);
+  T rhoY = velocityBMRho<T, DESCRIPTOR, 1, normalY>(cell, _u);
+  return (rhoX + rhoY) / (T)2;
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::computeU (
+  Cell<T,DESCRIPTOR> const& cell,
+  T u[DESCRIPTOR::d] ) const
+{
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    u[iD] = _u[iD];
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::computeJ (
+  Cell<T,DESCRIPTOR> const& cell,
+  T j[DESCRIPTOR::d] ) const
+{
+  computeU(cell, j);
+  T rho = computeRho(cell);
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    j[iD] *= rho;
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::computeU (
+  T u[DESCRIPTOR::d] ) const
+{
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    u[iD] = _u[iD];
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::defineRho (
+  Cell<T,DESCRIPTOR>& cell, T rho )
+{ }
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::defineU (
+  Cell<T,DESCRIPTOR>& cell,
+  const T u[DESCRIPTOR::d] )
+{
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    _u[iD] = u[iD];
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::defineU (
+  const T u[DESCRIPTOR::d] )
+{
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    _u[iD] = u[iD];
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::defineAllMomenta (
+  Cell<T,DESCRIPTOR>& cell,
+  T rho, const T u[DESCRIPTOR::d],
+  const T pi[util::TensorVal<DESCRIPTOR >::n] )
+{
+  for (int iD=0; iD<DESCRIPTOR::d; ++iD) {
+    _u[iD] = u[iD];
+  }
+}
+
+template<typename T, typename DESCRIPTOR,
+         int normalX, int normalY>
+void InnerCornerVelBM2D<T,DESCRIPTOR,normalX,normalY>::computeStress (
+  Cell<T,DESCRIPTOR> const& cell,
+  T rho, const T u[DESCRIPTOR::d],
+  T pi[util::TensorVal<DESCRIPTOR >::n] ) const
+{
+  typedef lbHelpers<T,DESCRIPTOR> lbH;
+  Cell<T,DESCRIPTOR> newCell(cell);
+  int v[DESCRIPTOR::d] = { -normalX, -normalY };
+  int unknownF  = util::findVelocity<DESCRIPTOR >(v);
+
+  if (unknownF != DESCRIPTOR::q) {
+    int oppositeF = util::opposite<DESCRIPTOR >(unknownF);
+
+    T uSqr = util::normSqr<T,DESCRIPTOR::d>(u);
+
+    newCell[unknownF] = newCell[oppositeF]
+                        - lbH::equilibrium(oppositeF, rho, u, uSqr)
+                        + lbH::equilibrium(unknownF, rho, u, uSqr);
+  }
+
+  lbH::computeStress(newCell, rho, u, pi);
+}
+
+
+}  // namespace olb
+
+#endif
-- 
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