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/porousBGKdynamics.h | 273 +++++++++++++++++++++++++++++++++++++++
1 file changed, 273 insertions(+)
create mode 100644 src/dynamics/porousBGKdynamics.h
(limited to 'src/dynamics/porousBGKdynamics.h')
diff --git a/src/dynamics/porousBGKdynamics.h b/src/dynamics/porousBGKdynamics.h
new file mode 100644
index 0000000..f0f3347
--- /dev/null
+++ b/src/dynamics/porousBGKdynamics.h
@@ -0,0 +1,273 @@
+/* This file is part of the OpenLB library
+ *
+ * Copyright (C) 2012 Lukas Baron, Mathias J. Krause, Jonas Latt
+ * E-mail contact: info@openlb.net
+ * The most recent release of OpenLB can be downloaded at
+ *
+ *
+ * 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 media -- header file.
+ */
+#ifndef POROUS_BGK_DYNAMICS_H
+#define POROUS_BGK_DYNAMICS_H
+
+#include "dynamics/dynamics.h"
+#include "core/cell.h"
+
+namespace olb {
+
+/// Implementation of the BGK collision step for a porosity model
+template
+class PorousBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ PorousBGKdynamics(T omega_, Momenta& momenta_);
+
+ /// Collision step
+ virtual void collide(Cell& cell,
+ LatticeStatistics& statistics_);
+
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+};
+
+/// Implementation of the BGK collision step for a porosity model enabling
+/// drag computation
+template
+class ExtendedPorousBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ ExtendedPorousBGKdynamics(T omega_, Momenta& momenta_);
+ /// extended Collision step, computes local drag in a given direction
+ virtual void collide(Cell& cell,
+ LatticeStatistics& statistics_);
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+};
+
+/// Implementation of the BGK collision step for subgridscale particles
+template
+class SubgridParticleBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ SubgridParticleBGKdynamics(T omega_, Momenta& momenta_);
+ /// extended Collision step, computes local drag in a given direction
+ virtual void collide(Cell& cell,
+ LatticeStatistics& statistics_);
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+ T _fieldTmp[4];
+};
+
+/* Implementation of the BGK collision for moving porous media (HLBM approach).
+ * As this scheme requires additionla data stored in an external field,
+ * it is meant to be used along with a PorousParticle descriptor.
+ * \param omega Lattice relaxation frequency
+ * \param momenta A standard object for the momenta computation
+ */
+template
+class PorousParticleBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ PorousParticleBGKdynamics(T omega_, Momenta& momenta_);
+ /// extended Collision step, computes local drag in a given direction
+ virtual void collide(Cell& cell,
+ LatticeStatistics& statistics_);
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+ /// This structure is used to emulate a "static if" to switch between static and
+ /// dynamic case. It can be replaced by a "constexpr if" when switching to C++17
+ /// standard.
+ template struct effectiveVelocity {
+ static void calculate(T* pExternal, T* pVelocity);
+ };
+};
+
+/// Implementation of the HBGK collision step for a porosity model enabling
+/// drag computation for many particles
+/// including the Krause turbulence modell
+
+template
+class KrauseHBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ KrauseHBGKdynamics(T omega_, Momenta& momenta_, T smagoConst_, T dx_ = 1, T dt_ = 1);
+ /// extended Collision step, computes local drag in a given direction
+ virtual void collide(Cell& cell,
+ LatticeStatistics& statistics_);
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ /// Computes a constant prefactor in order to speed up the computation
+ T computePreFactor(T omega_, T smagoConst_);
+ /// Computes the local smagorinsky relaxation parameter
+ void computeOmega(T omega0_, Cell& cell, T preFactor_, T rho_,
+ T u[DESCRIPTOR::d],
+ T newOmega[DESCRIPTOR::q] );
+
+private:
+
+ T omega; ///< relaxation parameter
+ /// effective collision time based upon Smagorisnky approach
+ T tau_eff;
+ /// Smagorinsky constant
+ T smagoConst;
+ /// Precomputed constant which speeeds up the computation
+ T preFactor;
+ T dx;
+ T dt;
+
+ T _fieldTmp[4];
+
+};
+
+/// Implementation of the BGK collision step for a porosity model enabling
+/// drag computation
+template
+class ParticlePorousBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ ParticlePorousBGKdynamics(T omega_, Momenta& momenta_);
+ /// extended Collision step, computes local drag in a given direction
+ virtual void collide(Cell& cell,
+ LatticeStatistics& statistics_);
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+};
+
+/// Implementation of the BGK collision step for a small particles enabling
+/// two way coupling
+template
+class SmallParticleBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ SmallParticleBGKdynamics(T omega_, Momenta& momenta_);
+ /// extended Collision step, computes local drag in a given direction
+ virtual void collide(Cell& cell,
+ LatticeStatistics& statistics_);
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+};
+
+
+enum Mode {M2, M3};
+
+/// Implementation of the Partially Saturated Method (PSM),
+/// see Krüger, Timm, et al. The Lattice Boltzmann Method. Springer, 2017. (p.447-451)
+template
+class PSMBGKdynamics : public BGKdynamics {
+public:
+ /// Constructor
+ PSMBGKdynamics(T omega_, Momenta& momenta_, int mode_=0);
+ /// Compute fluid velocity on the cell.
+ void computeU (
+ Cell const& cell,
+ T u[DESCRIPTOR::d] ) const override;
+ /// Compute fluid velocity and particle density on the cell.
+ void computeRhoU (
+ Cell const& cell,
+ T& rho, T u[DESCRIPTOR::d]) const override;
+ /// Collision step
+ void collide(Cell& cell,
+ LatticeStatistics& statistics_) override;
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+ T paramA; /// speed up parameter
+ Mode mode;
+};
+
+/// Implementation of the Partially Saturated Method (PSM),
+/// see Krüger, Timm, et al. The Lattice Boltzmann Method. Springer, 2017. (p.447-451)
+template
+class ForcedPSMBGKdynamics : public ForcedBGKdynamics {
+public:
+ /// Constructor
+ ForcedPSMBGKdynamics(T omega_, Momenta& momenta_, int mode_=0);
+ /// Compute fluid velocity on the cell.
+ void computeU (
+ Cell const& cell,
+ T u[DESCRIPTOR::d] ) const override;
+ /// Compute fluid velocity and particle density on the cell.
+ void computeRhoU (
+ Cell const& cell,
+ T& rho, T u[DESCRIPTOR::d]) const override;
+ /// Collision step
+ void collide(Cell& cell,
+ LatticeStatistics& statistics_) override;
+ /// get relaxation parameter
+ T getOmega() const;
+ /// set relaxation parameter
+ void setOmega(T omega_);
+
+
+private:
+ T omega; ///< relaxation parameter
+ T paramA; /// speed up parameter
+ Mode mode;
+};
+
+} // olb
+
+#endif
--
cgit v1.2.3