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/particles/forces/buoyancyForce3D.hh | 67 +++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 src/particles/forces/buoyancyForce3D.hh

(limited to 'src/particles/forces/buoyancyForce3D.hh')

diff --git a/src/particles/forces/buoyancyForce3D.hh b/src/particles/forces/buoyancyForce3D.hh
new file mode 100644
index 0000000..b05dada
--- /dev/null
+++ b/src/particles/forces/buoyancyForce3D.hh
@@ -0,0 +1,67 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2016 Thomas Henn
+ *  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.
+ */
+
+#ifndef BUOYANCYFORCE_3D_HH
+#define BUOYANCYFORCE_3D_HH
+
+#include <cmath>
+#include "buoyancyForce3D.h"
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+namespace olb {
+
+template<typename T, template<typename U> class PARTICLETYPE, typename DESCRIPTOR>
+BuoyancyForce3D<T, PARTICLETYPE, DESCRIPTOR>::BuoyancyForce3D(
+  UnitConverter<T,DESCRIPTOR> const& converter,
+  std::vector<T> direction, T g) :
+  Force3D<T, PARTICLETYPE>(),
+  _direction(direction), _g(g), _physDensity(converter.getPhysDensity() )
+{
+  T directionNorm = sqrt(
+                      pow(_direction[0], 2.) + pow(_direction[1], 2.)
+                      + pow(_direction[2], 2.));
+  for (int i = 0; i < 3; ++i) {
+    _direction[i] /= directionNorm;
+  }
+}
+
+template<typename T, template<typename U> class PARTICLETYPE, typename DESCRIPTOR>
+void BuoyancyForce3D<T, PARTICLETYPE, DESCRIPTOR>::applyForce(
+  typename std::deque<PARTICLETYPE<T> >::iterator p, int pInt,
+  ParticleSystem3D<T, PARTICLETYPE>& psSys)
+{
+  // weight force of fluid in similar volume like particle that replaces the fluid
+  // acts in direction opposite to weight force of particle
+
+  T factor = 4. / 3. * M_PI * std::pow(p->getRad(), 3) * _g
+             * _physDensity;
+  for (int j = 0; j < 3; ++j) {
+    p->getForce()[j] -= factor * _direction[j];
+  }
+}
+
+}
+#endif /* BUOYANCYFORCE_3D_HH */
-- 
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