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Diffstat (limited to 'src/dynamics/smagorinskyMRTdynamics.h')
-rw-r--r-- | src/dynamics/smagorinskyMRTdynamics.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/dynamics/smagorinskyMRTdynamics.h b/src/dynamics/smagorinskyMRTdynamics.h new file mode 100644 index 0000000..90009dd --- /dev/null +++ b/src/dynamics/smagorinskyMRTdynamics.h @@ -0,0 +1,95 @@ +/* This file is part of the OpenLB library + * + * Copyright (C) 2012 Patrick Nathen, Mathias J. Krause + * 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 + * MRT Dynamics with adjusted omega -- header file. + */ +#ifndef SMAGORINSKY_MRT_DYNAMICS_H +#define SMAGORINSKY_MRT_DYNAMICS_H + +#include "mrtDynamics.h" +#include "core/cell.h" + + +namespace olb { + +/// Implementation of the MRT collision step +template<typename T, typename DESCRIPTOR> +class SmagorinskyMRTdynamics : public MRTdynamics<T,DESCRIPTOR> { +public: + /// Constructor + SmagorinskyMRTdynamics(T omega_, Momenta<T,DESCRIPTOR>& momenta_, T smagoConst_, T dx_ = 1, T dt_ = 1); + + + // Collide + virtual void collide(Cell<T,DESCRIPTOR>& cell, + LatticeStatistics<T>& statistics_); + + /// Set local relaxation parameter of the dynamics + virtual void setOmega(T omega_); + + /// Get local smagorinsky relaxation parameter of the dynamics + virtual T getSmagorinskyOmega(Cell<T,DESCRIPTOR>& cell_); + +private: + /// Computes a constant prefactor in order to speed up the computation + T computePreFactor(T omega_, T smagoConst_); + + /// Computes the local smagorinsky relaxation parameter + T computeOmega(T omega0_, T preFactor_, T rho_, T pi_[util::TensorVal<DESCRIPTOR >::n] ); + +protected: + /// Smagorinsky constant + T smagoConst; + /// Precomputed constant which speeeds up the computation + T preFactor; + + T omega; // the shear viscosity relaxatin time + T lambda;// the bulk viscosity relaxatin time + + /// effective collision time based upon Smagorisnky approach + T tau_eff; + + + T dx; + T dt; + // Relaxation Time Matrix for + T invM_S_SGS[DESCRIPTOR::q][DESCRIPTOR::q]; + +}; + + +/// Implementation of the MRT collision step +template<typename T, typename DESCRIPTOR> +class SmagorinskyForcedMRTdynamics : public SmagorinskyMRTdynamics<T,DESCRIPTOR> { +public: + /// Constructor + SmagorinskyForcedMRTdynamics(T omega_, Momenta<T,DESCRIPTOR>& momenta_, T smagoConst_, T dx_, T dt_ ) : SmagorinskyMRTdynamics<T,DESCRIPTOR>(omega_, momenta_, smagoConst_, dx_, dt_ ) {}; + + // Collide + virtual void collide(Cell<T,DESCRIPTOR>& cell, + LatticeStatistics<T>& statistics_); +}; +} + +#endif |