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authorAdrian Kummerlaender2019-01-16 15:06:20 +0100
committerAdrian Kummerlaender2019-06-24 15:17:09 +0200
commit3d447eb5e493c112682e69e5fcd5c91807fcc7fc (patch)
treec81f701b17b16a56e275f3a874932d8e04457583
parent08e0d597bbf9c6f4c43df071410b69812ac9a8e2 (diff)
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Rename example to match its content, extract poiseuille2d
-rw-r--r--apps/adrian/cylinder2d/Makefile105
-rw-r--r--apps/adrian/cylinder2d/cylinder2d.cpp286
-rw-r--r--apps/adrian/cylinder2d/definitions.mk30
-rw-r--r--apps/adrian/cylinder2d/module.mk29
-rw-r--r--apps/adrian/poiseuille2d/poiseuille2d.cpp48
5 files changed, 458 insertions, 40 deletions
diff --git a/apps/adrian/cylinder2d/Makefile b/apps/adrian/cylinder2d/Makefile
new file mode 100644
index 0000000..a953954
--- /dev/null
+++ b/apps/adrian/cylinder2d/Makefile
@@ -0,0 +1,105 @@
+# This file is part of the OpenLB library
+#
+# Copyright (C) 2007 Mathias 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.
+
+###########################################################################
+## definitions
+
+include definitions.mk
+
+include $(ROOT)/global.mk
+
+OBJECTS := $(foreach file, $(SRC), $(PWD)/$(file:.cpp=.o))
+DEPS := $(foreach file, $(SRC), $(PWD)/$(file:.cpp=.d))
+
+###########################################################################
+## all
+
+all : depend compile link
+
+
+###########################################################################
+## dependencies
+
+depend : $(DEPS)
+
+$(PWD)/%.d : %.cpp
+ @echo Create dependencies for $<
+ @$(SHELL) -ec '$(CXX) -M $(CXXFLAGS) $(IDIR) $< \
+ | sed -e "s!$*\.o!$(PWD)\/$*\.o!1" > .tmpfile; \
+ cp -f .tmpfile $@;'
+
+###########################################################################
+## compile
+
+compile : $(OBJECTS)
+
+$(PWD)/%.o: %.cpp
+ @echo Compile $<
+ $(CXX) $(CXXFLAGS) $(IDIR) -c $< -o $@
+
+###########################################################################
+## clean
+
+clean : cleanrub cleanobj cleandep
+
+cleanrub:
+ @echo Clean rubbish files
+ @rm -f *~ core .tmpfile tmp/*.* $(OUTPUT)
+ @rm -f tmp/vtkData/*.* tmp/vtkData/data/*.* tmp/imageData/*.* tmp/gnuplotData/*.* tmp/gnuplotData/data/*.*
+
+cleanobj:
+ @echo Clean object files
+ @rm -f $(OBJECTS)
+
+cleandep:
+ @echo Clean dependencies files
+ @rm -f $(DEPS)
+
+cleanbuild:
+ @cd $(ROOT); \
+ $(MAKE) cleanlib;
+
+###########################################################################
+## update lib
+
+$(ROOT)/$(LIBDIR)/lib$(LIB).a :
+ @cd $(ROOT); \
+ $(MAKE) all
+
+###########################################################################
+## link
+
+link: $(OUTPUT)
+
+$(OUTPUT): $(OBJECTS) $(ROOT)/$(LIBDIR)/lib$(LIB).a
+ @echo Link $@
+ $(CXX) $(foreach file, $(SRC), $(file:.cpp=.o)) $(LDFLAGS) -L$(ROOT)/$(LIBDIR) -l$(LIB) -lz -o $@
+
+###########################################################################
+## include dependencies
+
+ifneq "$(strip $(wildcard *.d))" ""
+ include $(foreach file,$(DEPS),$(file))
+endif
+
+###########################################################################
+###########################################################################
diff --git a/apps/adrian/cylinder2d/cylinder2d.cpp b/apps/adrian/cylinder2d/cylinder2d.cpp
new file mode 100644
index 0000000..0cdfa7b
--- /dev/null
+++ b/apps/adrian/cylinder2d/cylinder2d.cpp
@@ -0,0 +1,286 @@
+/* Lattice Boltzmann sample, written in C++, using the OpenLB
+ * library
+ *
+ * Copyright (C) 2007, 2012 Jonas Latt, Mathias J. Krause
+ * Vojtech Cvrcek, Peter Weisbrod
+ * 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.
+ */
+
+#include "olb2D.h"
+#ifndef OLB_PRECOMPILED
+#include "olb2D.hh"
+#endif
+
+#include <vector>
+
+using namespace olb;
+using namespace olb::descriptors;
+
+typedef double T;
+
+#define DESCRIPTOR D2Q9Descriptor
+
+const T lx = 8.0; // length of the channel
+const T ly = 2.0; // height of the channel
+const int N = 50; // resolution of the model
+const T Re = 200.; // Reynolds number
+const T baseTau = 0.8; // Relaxation time of coarsest grid
+const T maxPhysT = 60.; // max. simulation time in s, SI unit
+const T physInterval = 0.25; // interval for the convergence check in s
+const T residuum = 1e-5; // residuum for the convergence check
+
+
+void prepareGeometry(Grid2D<T,DESCRIPTOR>& grid)
+{
+ OstreamManager clout(std::cout,"prepareGeometry");
+ clout << "Prepare Geometry ..." << std::endl;
+
+ auto& converter = grid.getConverter();
+ auto& sGeometry = grid.getSuperGeometry();
+
+ sGeometry.rename(0,1);
+
+ const T physSpacing = converter.getPhysDeltaX();
+
+ // Set material number for bounce back boundaries
+ {
+ const Vector<T,2> wallExtend {lx+physSpacing, physSpacing/2};
+ const Vector<T,2> wallOrigin {-physSpacing/4, -physSpacing/4};
+
+ IndicatorCuboid2D<T> lowerWall(wallExtend, wallOrigin);
+ sGeometry.rename(1,2,lowerWall);
+
+ IndicatorCuboid2D<T> upperWall(wallExtend, wallOrigin + Vector<T,2> {0,ly});
+ sGeometry.rename(1,2,upperWall);
+ }
+
+ // Set material number for inflow and outflow
+ {
+ const Vector<T,2> extend { physSpacing/2, ly};
+ const Vector<T,2> origin {-physSpacing/4, -physSpacing/4};
+
+ IndicatorCuboid2D<T> inflow(extend, origin);
+ sGeometry.rename(1,3,inflow);
+
+ IndicatorCuboid2D<T> outflow(extend, origin + Vector<T,2> {lx,0});
+ sGeometry.rename(1,4,outflow);
+ }
+
+ // Set material number for vertically centered obstacle
+ {
+ const Vector<T,2> origin {1.25, ly/2};
+ IndicatorCircle2D<T> obstacle(origin, 0.1);
+ sGeometry.rename(1,2,obstacle);
+ }
+
+ sGeometry.clean();
+ sGeometry.innerClean();
+ sGeometry.checkForErrors();
+ sGeometry.print();
+
+ clout << "Prepare Geometry ... OK" << std::endl;
+}
+
+void prepareLattice(Grid2D<T,DESCRIPTOR>& grid,
+ Dynamics<T, DESCRIPTOR>& bulkDynamics,
+ sOnLatticeBoundaryCondition2D<T,DESCRIPTOR>& sBoundaryCondition)
+{
+ OstreamManager clout(std::cout,"prepareLattice");
+ clout << "Prepare lattice ..." << std::endl;
+
+ auto& converter = grid.getConverter();
+ auto& sGeometry = grid.getSuperGeometry();
+ auto& sLattice = grid.getSuperLattice();
+
+ const T omega = converter.getLatticeRelaxationFrequency();
+
+ sLattice.defineDynamics(sGeometry, 0, &instances::getNoDynamics<T, DESCRIPTOR>());
+ sLattice.defineDynamics(sGeometry, 1, &bulkDynamics); // bulk
+ sLattice.defineDynamics(sGeometry, 2, &instances::getBounceBack<T, DESCRIPTOR>());
+ sLattice.defineDynamics(sGeometry, 3, &bulkDynamics); // inflow
+ sLattice.defineDynamics(sGeometry, 4, &bulkDynamics); // outflow
+
+ sBoundaryCondition.addVelocityBoundary(sGeometry, 3, omega);
+ sBoundaryCondition.addVelocityBoundary(sGeometry, 4, omega);
+
+ const T Lx = converter.getLatticeLength(lx);
+ const T Ly = converter.getLatticeLength(ly);
+ const T p0 = 8.*converter.getLatticeViscosity()*converter.getCharLatticeVelocity()*Lx/(Ly*Ly);
+ AnalyticalLinear2D<T,T> rho(-p0/lx*DESCRIPTOR<T>::invCs2, 0, p0*DESCRIPTOR<T>::invCs2+1);
+
+ const T maxVelocity = converter.getCharLatticeVelocity();
+ const T radius = ly/2;
+ std::vector<T> axisPoint{0, ly/2};
+ std::vector<T> axisDirection{1, 0};
+ Poiseuille2D<T> u(axisPoint, axisDirection, maxVelocity, radius);
+
+ sLattice.defineRhoU(sGeometry, 1, rho, u);
+ sLattice.iniEquilibrium(sGeometry, 1, rho, u);
+ sLattice.defineRhoU(sGeometry, 2, rho, u);
+ sLattice.iniEquilibrium(sGeometry, 2, rho, u);
+
+ sLattice.defineRhoU(sGeometry, 3, rho, u);
+ sLattice.iniEquilibrium(sGeometry, 3, rho, u);
+ sLattice.defineRhoU(sGeometry, 4, rho, u);
+ sLattice.iniEquilibrium(sGeometry, 4, rho, u);
+
+ sLattice.initialize();
+
+ clout << "Prepare lattice ... OK" << std::endl;
+}
+
+void getResults(const std::string& prefix,
+ Grid2D<T,DESCRIPTOR>& grid,
+ int iT, Timer<T>& timer, bool hasConverged)
+{
+ OstreamManager clout(std::cout,"getResults");
+
+ auto& converter = grid.getConverter();
+ auto& sLattice = grid.getSuperLattice();
+ auto& sGeometry = grid.getSuperGeometry();
+
+ SuperVTMwriter2D<T> vtmWriter(prefix + "cylinder2d");
+ SuperLatticePhysVelocity2D<T, DESCRIPTOR> velocity(sLattice, converter);
+ SuperLatticePhysPressure2D<T, DESCRIPTOR> pressure(sLattice, converter);
+ SuperLatticeGeometry2D<T, DESCRIPTOR> geometry(sLattice, sGeometry);
+ vtmWriter.addFunctor(geometry);
+ vtmWriter.addFunctor(velocity);
+ vtmWriter.addFunctor(pressure);
+
+ const int statIter = converter.getLatticeTime(maxPhysT/10.);
+
+ if (iT==0) {
+ vtmWriter.createMasterFile();
+ }
+
+ if (iT%20==0) {
+ vtmWriter.write(iT);
+ }
+
+ if (iT%statIter==0 || hasConverged) {
+ timer.update(iT);
+ timer.printStep();
+
+ sLattice.getStatistics().print(iT,converter.getPhysTime(iT));
+ }
+}
+
+int main(int argc, char* argv[])
+{
+ olbInit(&argc, &argv);
+ singleton::directories().setOutputDir("./tmp/");
+ OstreamManager clout(std::cout,"main");
+
+ const Vector<T,2> coarseOrigin {0.0, 0.0};
+ const Vector<T,2> coarseExtend {lx, ly};
+ IndicatorCuboid2D<T> coarseCuboid(coarseExtend, coarseOrigin);
+
+ Grid2D<T,DESCRIPTOR> coarseGrid(coarseCuboid, N, baseTau, Re);
+ prepareGeometry(coarseGrid);
+
+ const Vector<T,2> fineExtend {3.0, 1.5};
+ const Vector<T,2> fineOrigin {0.8, (ly-fineExtend[1])/2};
+
+ auto& fineGrid = coarseGrid.refine(fineOrigin, fineExtend);
+ prepareGeometry(fineGrid);
+
+ auto refinedOverlap = fineGrid.getRefinedOverlap();
+ coarseGrid.getSuperGeometry().rename(1,0,*refinedOverlap);
+ coarseGrid.getSuperGeometry().rename(2,0,*refinedOverlap);
+
+ BGKdynamics<T, DESCRIPTOR> coarseBulkDynamics(
+ coarseGrid.getConverter().getLatticeRelaxationFrequency(),
+ instances::getBulkMomenta<T, DESCRIPTOR>());
+
+ sOnLatticeBoundaryCondition2D<T, DESCRIPTOR> coarseSBoundaryCondition(coarseGrid.getSuperLattice());
+ createLocalBoundaryCondition2D<T, DESCRIPTOR>(coarseSBoundaryCondition);
+
+ prepareLattice(coarseGrid, coarseBulkDynamics, coarseSBoundaryCondition);
+
+ BGKdynamics<T, DESCRIPTOR> fineBulkDynamics(
+ fineGrid.getConverter().getLatticeRelaxationFrequency(),
+ instances::getBulkMomenta<T, DESCRIPTOR>());
+
+ sOnLatticeBoundaryCondition2D<T, DESCRIPTOR> fineSBoundaryCondition(fineGrid.getSuperLattice());
+ createLocalBoundaryCondition2D<T, DESCRIPTOR>(fineSBoundaryCondition);
+
+ const Vector<T,2> fineExtend2 {0.6, 0.4};
+ const Vector<T,2> fineOrigin2 {1.05, (ly-fineExtend2[1])/2};
+
+ auto& fineGrid2 = fineGrid.refine(fineOrigin2, fineExtend2);
+ prepareGeometry(fineGrid2);
+
+ auto refinedOverlap2 = fineGrid2.getRefinedOverlap();
+ fineGrid.getSuperGeometry().rename(1,0,*refinedOverlap2);
+ fineGrid.getSuperGeometry().rename(2,0,*refinedOverlap2);
+
+ prepareLattice(fineGrid, fineBulkDynamics, fineSBoundaryCondition);
+
+ BGKdynamics<T, DESCRIPTOR> fineBulkDynamics2(
+ fineGrid2.getConverter().getLatticeRelaxationFrequency(),
+ instances::getBulkMomenta<T, DESCRIPTOR>());
+
+ sOnLatticeBoundaryCondition2D<T, DESCRIPTOR> fineSBoundaryCondition2(fineGrid2.getSuperLattice());
+ createLocalBoundaryCondition2D<T, DESCRIPTOR>(fineSBoundaryCondition2);
+
+ prepareLattice(fineGrid2, fineBulkDynamics2, fineSBoundaryCondition2);
+
+ clout << "starting simulation..." << endl;
+ Timer<T> timer(
+ coarseGrid.getConverter().getLatticeTime(maxPhysT),
+ coarseGrid.getSuperGeometry().getStatistics().getNvoxel());
+ util::ValueTracer<T> converge(
+ fineGrid2.getConverter().getLatticeTime(physInterval),
+ residuum);
+ timer.start();
+
+ for (int iT = 0; iT < coarseGrid.getConverter().getLatticeTime(maxPhysT); ++iT) {
+ if (converge.hasConverged()) {
+ clout << "Simulation converged." << endl;
+ break;
+ }
+
+ coarseGrid.collideAndStream();
+
+ getResults(
+ "coarse_",
+ coarseGrid,
+ iT,
+ timer,
+ converge.hasConverged());
+ getResults(
+ "fine_",
+ fineGrid,
+ iT,
+ timer,
+ converge.hasConverged());
+ getResults(
+ "fine2_",
+ fineGrid2,
+ iT,
+ timer,
+ converge.hasConverged());
+
+ converge.takeValue(fineGrid2.getSuperLattice().getStatistics().getAverageEnergy(), true);
+ }
+
+ timer.stop();
+ timer.printSummary();
+}
diff --git a/apps/adrian/cylinder2d/definitions.mk b/apps/adrian/cylinder2d/definitions.mk
new file mode 100644
index 0000000..6584906
--- /dev/null
+++ b/apps/adrian/cylinder2d/definitions.mk
@@ -0,0 +1,30 @@
+# This file is part of the OpenLB library
+#
+# Copyright (C) 2007 Mathias 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.
+
+
+###########################################################################
+###########################################################################
+## DEFINITIONS TO BE CHANGED
+
+ROOT := ../../..
+SRC := cylinder2d.cpp
+OUTPUT := cylinder2d
diff --git a/apps/adrian/cylinder2d/module.mk b/apps/adrian/cylinder2d/module.mk
new file mode 100644
index 0000000..1190482
--- /dev/null
+++ b/apps/adrian/cylinder2d/module.mk
@@ -0,0 +1,29 @@
+# This file is part of the OpenLB library
+#
+# Copyright (C) 2017 Markus Mohrhard
+# 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.
+
+current_dir := $(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))
+
+include global.mk
+include rules.mk
+include $(addsuffix definitions.mk, $(current_dir))
+
+$(eval $(call sample,$(current_dir)$(OUTPUT),$(addprefix $(current_dir), $(SRC))))
diff --git a/apps/adrian/poiseuille2d/poiseuille2d.cpp b/apps/adrian/poiseuille2d/poiseuille2d.cpp
index 7112f58..b6c2f52 100644
--- a/apps/adrian/poiseuille2d/poiseuille2d.cpp
+++ b/apps/adrian/poiseuille2d/poiseuille2d.cpp
@@ -37,10 +37,10 @@ typedef double T;
#define DESCRIPTOR D2Q9Descriptor
-const T lx = 8.0; // length of the channel
-const T ly = 2.0; // height of the channel
+const T lx = 4.0; // length of the channel
+const T ly = 1.0; // height of the channel
const int N = 50; // resolution of the model
-const T Re = 200.; // Reynolds number
+const T Re = 100.; // Reynolds number
const T baseTau = 0.8; // Relaxation time of coarsest grid
const T maxPhysT = 60.; // max. simulation time in s, SI unit
const T physInterval = 0.25; // interval for the convergence check in s
@@ -83,13 +83,6 @@ void prepareGeometry(Grid2D<T,DESCRIPTOR>& grid)
sGeometry.rename(1,4,outflow);
}
- // Set material number for vertically centered obstacle
- {
- const Vector<T,2> origin {1.25, ly/2};
- IndicatorCircle2D<T> obstacle(origin, 0.1);
- sGeometry.rename(1,2,obstacle);
- }
-
sGeometry.clean();
sGeometry.innerClean();
sGeometry.checkForErrors();
@@ -170,7 +163,7 @@ void getResults(const std::string& prefix,
vtmWriter.createMasterFile();
}
- if (iT%20==0) {
+ if (iT%100==0) {
vtmWriter.write(iT);
}
@@ -195,8 +188,8 @@ int main(int argc, char* argv[])
Grid2D<T,DESCRIPTOR> coarseGrid(coarseCuboid, N, baseTau, Re);
prepareGeometry(coarseGrid);
- const Vector<T,2> fineExtend {3.0, 1.5};
- const Vector<T,2> fineOrigin {0.8, (ly-fineExtend[1])/2};
+ const Vector<T,2> fineExtend {2.0, 0.5};
+ const Vector<T,2> fineOrigin {1.0, (ly-fineExtend[1])/2};
auto& fineGrid = coarseGrid.refine(fineOrigin, fineExtend);
prepareGeometry(fineGrid);
@@ -221,33 +214,14 @@ int main(int argc, char* argv[])
sOnLatticeBoundaryCondition2D<T, DESCRIPTOR> fineSBoundaryCondition(fineGrid.getSuperLattice());
createLocalBoundaryCondition2D<T, DESCRIPTOR>(fineSBoundaryCondition);
- const Vector<T,2> fineExtend2 {0.6, 0.4};
- const Vector<T,2> fineOrigin2 {1.05, (ly-fineExtend2[1])/2};
-
- auto& fineGrid2 = fineGrid.refine(fineOrigin2, fineExtend2);
- prepareGeometry(fineGrid2);
-
- auto refinedOverlap2 = fineGrid2.getRefinedOverlap();
- fineGrid.getSuperGeometry().rename(1,0,*refinedOverlap2);
- fineGrid.getSuperGeometry().rename(2,0,*refinedOverlap2);
-
prepareLattice(fineGrid, fineBulkDynamics, fineSBoundaryCondition);
- BGKdynamics<T, DESCRIPTOR> fineBulkDynamics2(
- fineGrid2.getConverter().getLatticeRelaxationFrequency(),
- instances::getBulkMomenta<T, DESCRIPTOR>());
-
- sOnLatticeBoundaryCondition2D<T, DESCRIPTOR> fineSBoundaryCondition2(fineGrid2.getSuperLattice());
- createLocalBoundaryCondition2D<T, DESCRIPTOR>(fineSBoundaryCondition2);
-
- prepareLattice(fineGrid2, fineBulkDynamics2, fineSBoundaryCondition2);
-
clout << "starting simulation..." << endl;
Timer<T> timer(
coarseGrid.getConverter().getLatticeTime(maxPhysT),
coarseGrid.getSuperGeometry().getStatistics().getNvoxel());
util::ValueTracer<T> converge(
- fineGrid2.getConverter().getLatticeTime(physInterval),
+ fineGrid.getConverter().getLatticeTime(physInterval),
residuum);
timer.start();
@@ -271,14 +245,8 @@ int main(int argc, char* argv[])
iT,
timer,
converge.hasConverged());
- getResults(
- "fine2_",
- fineGrid2,
- iT,
- timer,
- converge.hasConverged());
- converge.takeValue(fineGrid2.getSuperLattice().getStatistics().getAverageEnergy(), true);
+ converge.takeValue(fineGrid.getSuperLattice().getStatistics().getAverageEnergy(), true);
}
timer.stop();