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/smagorinskyGuoZhaoDynamics.hh | 118 +++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 src/dynamics/smagorinskyGuoZhaoDynamics.hh

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

diff --git a/src/dynamics/smagorinskyGuoZhaoDynamics.hh b/src/dynamics/smagorinskyGuoZhaoDynamics.hh
new file mode 100644
index 0000000..6a2ba73
--- /dev/null
+++ b/src/dynamics/smagorinskyGuoZhaoDynamics.hh
@@ -0,0 +1,118 @@
+/*  This file is part of the OpenLB library
+ *
+ *  Copyright (C) 2016-2017 Davide Dapelo, Mathias J. Krause
+ *  OpenLB 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
+ * Specific dynamics classes for Guo and Zhao (2002) porous model
+ * with a Smagorinsky LES turbulence model, with
+ * which a Cell object can be instantiated -- generic implementation.
+ */
+#ifndef LB_SMAGO_GUOZHAO_DYNAMICS_HH
+#define LB_SMAGO_GUOZHAO_DYNAMICS_HH
+
+#include <algorithm>
+#include <limits>
+#include "dynamics/dynamics.h"
+#include "core/cell.h"
+#include "dynamics/guoZhaoLbHelpers.h"
+#include "dynamics/firstOrderLbHelpers.h"
+
+namespace olb {
+
+////////////////////// Class SmagorinskyGuoZhaoBGKdynamics /////////////////////////
+
+/** \param omega_ relaxation parameter, related to the dynamic viscosity
+ *  \param momenta_ a Momenta object to know how to compute velocity momenta
+ */
+template<typename T, typename DESCRIPTOR>
+SmagorinskyGuoZhaoBGKdynamics<T,DESCRIPTOR>::SmagorinskyGuoZhaoBGKdynamics (T omega_,
+    Momenta<T,DESCRIPTOR>& momenta_, T smagoConst_, T dx_, T dt_ )
+  : GuoZhaoBGKdynamics<T,DESCRIPTOR>(omega_,momenta_), smagoConst(smagoConst_),
+    preFactor(computePreFactor(omega_,smagoConst_) )
+{ }
+
+template<typename T, typename DESCRIPTOR>
+void SmagorinskyGuoZhaoBGKdynamics<T,DESCRIPTOR>::collide (
+  Cell<T,DESCRIPTOR>& cell,
+  LatticeStatistics<T>& statistics )
+{
+  // Copying epsilon from
+  // external to member variable to provide access for computeEquilibrium.
+  this->updateEpsilon(cell);
+  T rho, u[DESCRIPTOR::d], pi[util::TensorVal<DESCRIPTOR >::n];
+  this->_momenta.computeAllMomenta(cell, rho, u, pi);
+  T newOmega = computeOmega(this->getOmega(), preFactor, rho, pi);
+  T* force = cell.template getFieldPointer<descriptors::FORCE>();
+  for (int iVel=0; iVel<DESCRIPTOR::d; ++iVel) {
+    u[iVel] += force[iVel] / (T)2.;
+  }
+  T uSqr = GuoZhaoLbHelpers<T,DESCRIPTOR>::bgkCollision(cell, this->getEpsilon(), rho, u, newOmega);
+  GuoZhaoLbHelpers<T,DESCRIPTOR>::updateGuoZhaoForce(cell, u);
+  lbHelpers<T,DESCRIPTOR>::addExternalForce(cell, u, newOmega, rho);
+  statistics.incrementStats(rho, uSqr);
+}
+
+template<typename T, typename DESCRIPTOR>
+T SmagorinskyGuoZhaoBGKdynamics<T,DESCRIPTOR>::getSmagorinskyOmega(Cell<T,DESCRIPTOR>& cell )
+{
+  T rho, uTemp[DESCRIPTOR::d], pi[util::TensorVal<DESCRIPTOR >::n];
+  this->_momenta.computeAllMomenta(cell, rho, uTemp, pi);
+  T newOmega = computeOmega(this->getOmega(), preFactor, rho, pi);
+  return newOmega;
+}
+
+template<typename T, typename DESCRIPTOR>
+T SmagorinskyGuoZhaoBGKdynamics<T,DESCRIPTOR>::computePreFactor(T omega_, T smagoConst_)
+{
+  return (T)smagoConst_*smagoConst_*descriptors::invCs2<T,DESCRIPTOR>()*descriptors::invCs2<T,DESCRIPTOR>()*2*sqrt(2);
+}
+
+template<typename T, typename DESCRIPTOR>
+void SmagorinskyGuoZhaoBGKdynamics<T,DESCRIPTOR>::setOmega(T omega)
+{
+//  _omega = omega;
+  GuoZhaoBGKdynamics<T,DESCRIPTOR>::setOmega(omega);
+  preFactor = computePreFactor(omega, smagoConst);
+}
+
+template<typename T, typename DESCRIPTOR>
+T SmagorinskyGuoZhaoBGKdynamics<T,DESCRIPTOR>::computeOmega(T omega0, T preFactor_, T rho,
+    T pi[util::TensorVal<DESCRIPTOR >::n] )
+{
+  T PiNeqNormSqr = pi[0]*pi[0] + 2.0*pi[1]*pi[1] + pi[2]*pi[2];
+  if (util::TensorVal<DESCRIPTOR >::n == 6) {
+    PiNeqNormSqr += pi[2]*pi[2] + pi[3]*pi[3] + 2*pi[4]*pi[4] +pi[5]*pi[5];
+  }
+  T PiNeqNorm    = sqrt(PiNeqNormSqr);
+  /// Molecular realaxation time
+  T tau_mol = 1. /omega0;
+  /// Turbulent realaxation time
+  T tau_turb = 0.5*(sqrt(tau_mol*tau_mol + preFactor_/rho*PiNeqNorm) - tau_mol);
+  /// Effective realaxation time
+  tau_eff = tau_mol+tau_turb;
+  T omega_new= 1./tau_eff;
+  return omega_new;
+}
+
+}
+
+#endif
-- 
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