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/dynamics/porousForcedBGKDynamics.hh | 104 ++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 src/dynamics/porousForcedBGKDynamics.hh

(limited to 'src/dynamics/porousForcedBGKDynamics.hh')

diff --git a/src/dynamics/porousForcedBGKDynamics.hh b/src/dynamics/porousForcedBGKDynamics.hh
new file mode 100644
index 0000000..b6f06a0
--- /dev/null
+++ b/src/dynamics/porousForcedBGKDynamics.hh
@@ -0,0 +1,104 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2016 Asher Zarth, Thomas Henn, Mathias J. Krause, 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
+ * BGK Dynamics for porous -- generic implementation.
+ */
+#ifndef POROUS_FORCED_BGK_DYNAMICS_HH
+#define POROUS_FORCED_BGK_DYNAMICS_HH
+
+#include "porousForcedBGKDynamics.h"
+#include "core/cell.h"
+#include "dynamics.h"
+#include "core/util.h"
+#include "lbHelpers.h"
+#include "math.h"
+
+namespace olb {
+
+////////////////////// Class PorousForcedBGKdynamics //////////////////////////
+
+template<typename T, typename DESCRIPTOR>
+PorousForcedBGKdynamics<T,DESCRIPTOR>::PorousForcedBGKdynamics (
+  T omega, Momenta<T,DESCRIPTOR>& momenta)
+  : BasicDynamics<T,DESCRIPTOR>(momenta),
+    _omega(omega)
+{
+  OLB_PRECONDITION( DESCRIPTOR::template provides<descriptors::FORCE>() );
+}
+
+template<typename T, typename DESCRIPTOR>
+void PorousForcedBGKdynamics<T,DESCRIPTOR>::computeU (Cell<T,DESCRIPTOR> const& cell, T u[DESCRIPTOR::d] ) const
+{
+  T rho;
+  this->_momenta.computeRhoU(cell, rho, u);
+  for (int iVel=0; iVel<DESCRIPTOR::d; ++iVel) {
+    u[iVel] += cell.template getFieldPointer<descriptors::FORCE>()[iVel] / (T)2.;
+  }
+}
+
+template<typename T, typename DESCRIPTOR>
+void PorousForcedBGKdynamics<T,DESCRIPTOR>::computeRhoU (Cell<T,DESCRIPTOR> const& cell, T& rho, T u[DESCRIPTOR::d] ) const
+{
+  this->_momenta.computeRhoU(cell, rho, u);
+  for (int iVel=0; iVel<DESCRIPTOR::d; ++iVel) {
+    u[iVel] += cell.template getFieldPointer<descriptors::FORCE>()[iVel] / (T)2.;
+  }
+}
+
+
+template<typename T, typename DESCRIPTOR>
+void PorousForcedBGKdynamics<T,DESCRIPTOR>::collide (
+  Cell<T,DESCRIPTOR>& cell,
+  LatticeStatistics<T>& statistics )
+{
+  T rho, u[DESCRIPTOR::d];
+  this->_momenta.computeRhoU(cell, rho, u);
+  T* force = cell.template getFieldPointer<descriptors::FORCE>();
+  for (int iVel=0; iVel<DESCRIPTOR::d; ++iVel) {
+    u[iVel] += force[iVel] / (T)2.;
+  }
+  T* porosity = cell.template getFieldPointer<descriptors::POROSITY>();
+  for (int i=0; i<DESCRIPTOR::d; i++)  {
+    u[i] *= porosity[0];
+  }
+  T uSqr = lbHelpers<T,DESCRIPTOR>::bgkCollision(cell, rho, u, _omega);
+  lbHelpers<T,DESCRIPTOR>::addExternalForce(cell, u, _omega, rho);
+  statistics.incrementStats(rho, uSqr);
+}
+
+template<typename T, typename DESCRIPTOR>
+T PorousForcedBGKdynamics<T,DESCRIPTOR>::getOmega() const
+{
+  return _omega;
+}
+
+template<typename T, typename DESCRIPTOR>
+void PorousForcedBGKdynamics<T,DESCRIPTOR>::setOmega(T omega)
+{
+  _omega = omega;
+}
+
+} // olb
+
+#endif
-- 
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