Karman Vortex trials

BasicSolver/2D-seq/backstep.par

@@ -32,7 +32,7 @@ jmax       45	   # number of interior cells in y-direction
 # Time Data:
 # ---------
 
-te      30.0   # final time
+te      60.0   # final time
 dt      0.02    # time stepsize
 tau     0.5     # safety factor for time stepsize control (<0 constant delt)
 
@@ -49,7 +49,7 @@ gamma    0.9       # upwind differencing factor gamma
 # -----------------------
 
 numberOfParticles   60
-startTime           0
+startTime           100.0
 injectTimePeriod    0.5
 writeTimePeriod     0.2
 

BasicSolver/2D-seq/karman.par

@@ -15,11 +15,11 @@ bcRight    3			#
 gx    0.0      # Body forces (e.g. gravity)
 gy    0.0      #
 
-re    10000.0	   # Reynolds number
+re    5050.0	   # Reynolds number
 
 u_init    1.0      # initial value for velocity in x-direction
 v_init    0.0      # initial value for velocity in y-direction
-p_init    0.0      # initial value for pressure
+p_init    1.0      # initial value for pressure
 
 # Geometry Data:
 # -------------
@@ -32,7 +32,7 @@ jmax       50	   # number of interior cells in y-direction
 # Time Data:
 # ---------
 
-te      100.0   # final time
+te      150.0   # final time
 dt      0.02    # time stepsize
 tau     0.5     # safety factor for time stepsize control (<0 constant delt)
 
@@ -48,13 +48,13 @@ gamma    0.9       # upwind differencing factor gamma
 # Particle Tracing Data:
 # -----------------------
 
-numberOfParticles   60
-startTime           0
-injectTimePeriod    0.5
+numberOfParticles   200
+startTime           50
+injectTimePeriod    1.0
 writeTimePeriod     0.5
 
 x1                  0.0
-y1                  1.9
+y1                  1.8
 x2                  0.0
 y2                  2.1
 
@@ -63,7 +63,7 @@ y2                  2.1
 # Shape 0 disable, 1 Rectangle/Square, 2 Circle
 
 shape               2 
-xCenter             4.0
+xCenter             5.0
 yCenter             2.0
 xRectLength         2.0
 yRectLength         1.0

BasicSolver/2D-seq/src/main.c

@@ -78,7 +78,7 @@ int main (int argc, char** argv)
         
 
         /* Added function for particle tracing. Will inject and advance particles as per timePeriod */
-        trace(&particletracer, solver.u, solver.v, t);
+        trace(&particletracer, solver.u, solver.v, solver.s, t);
 
         t += solver.dt;
         nt++;

BasicSolver/2D-seq/src/particletracing.c

@@ -14,6 +14,7 @@
 
 #define U(i, j)  u[(j) * (imax + 2) + (i)]
 #define V(i, j)  v[(j) * (imax + 2) + (i)]
+#define S(i, j)  s[(j) * (imax + 2) + (i)]
 
 static int ts = 0;
 void printParticles(ParticleTracer* particletracer)
@@ -37,7 +38,7 @@ void injectParticles(ParticleTracer* particletracer)
     }
 }
 
-void advanceParticles(ParticleTracer* particletracer, double* restrict u, double* restrict v, double time)
+void advanceParticles(ParticleTracer* particletracer, double* restrict u, double* restrict v, int* restrict s, double time)
 {
     int imax = particletracer->imax;
     int jmax = particletracer->jmax;
@@ -101,6 +102,11 @@ void advanceParticles(ParticleTracer* particletracer, double* restrict u, double
             {
                 particletracer->particlePool[i].flag = false;
             }
+            int i_new = new_x/dx, j_new = new_y/dy;
+            if(S(i_new, j_new) == LOCAL)
+            {
+                particletracer->particlePool[i].flag = false;
+            }
         }
     }
 }
@@ -116,10 +122,10 @@ void writeParticles(ParticleTracer* particletracer)
     VtkOptions opts = { .particletracer = particletracer };
 
     char filename[50];
-    snprintf(filename, 50, "vtk_files/particles%d.vtk", ts);
-    vtkOpen(&opts, filename, ts);
-    vtkParticle(&opts, "particle");
-    vtkClose(&opts);
+    // snprintf(filename, 50, "vtk_files/particles%d.vtk", ts);
+    // vtkOpen(&opts, filename, ts);
+    // vtkParticle(&opts, "particle");
+    // vtkClose(&opts);
 
     FILE* fp;
     Particle* particlePool = particletracer->particlePool;
@@ -177,6 +183,7 @@ void initParticleTracer(ParticleTracer* particletracer, Parameter* params)
     particletracer->particlePool      = malloc(sizeof(Particle) * particletracer->estimatedNumParticles);
     particletracer->linSpaceLine      = malloc(sizeof(Particle) * particletracer->numberOfParticles);
     
+
     for (int i = 0; i < particletracer->numberOfParticles; ++i) 
     {
         double spacing                      = (double)i / (double)(particletracer->numberOfParticles - 1);
@@ -197,7 +204,7 @@ void printParticleTracerParameters(ParticleTracer* particletracer)
     printf("\tdt : %.2f, dx : %.2f, dy : %.2f\n", particletracer->dt, particletracer->dx, particletracer->dy);
 }   
 
-void trace(ParticleTracer* particletracer, double* u, double* v, double time)
+void trace(ParticleTracer* particletracer, double* u, double* v, int* s, double time)
 {
     if (time >= particletracer->startTime)
     {
@@ -213,7 +220,7 @@ void trace(ParticleTracer* particletracer, double* u, double* v, double time)
             particletracer->lastWriteTime = time;
 
         }
-        advanceParticles(particletracer, u, v, time);
+        advanceParticles(particletracer, u, v, s, time);
         compress(particletracer);
         particletracer->lastUpdateTime = time;   
     }

BasicSolver/2D-seq/src/particletracing.h

@@ -38,11 +38,11 @@ typedef struct {
 
 void initParticleTracer(ParticleTracer*, Parameter*);
 void injectParticles(ParticleTracer*);
-void advanceParticles(ParticleTracer*, double* , double*, double);
+void advanceParticles(ParticleTracer*, double* , double*, int*, double);
 void freeParticles(ParticleTracer*);
 void writeParticles(ParticleTracer*);
 void printParticleTracerParameters(ParticleTracer*);
 void printParticles(ParticleTracer*);
-void trace(ParticleTracer*, double* , double* , double );
+void trace(ParticleTracer*, double* , double* , int* , double );
 void compress(ParticleTracer* );
 #endif

BasicSolver/2D-seq/vector.plot

@@ -1,5 +1,7 @@
 set terminal png size 3600,768 enhanced font ,28
 set output 'velocity.png'
+set xrange[0:30]
+set yrange[0:4]
 set size ratio -1
 set datafile separator whitespace
 

BasicSolver/2D-seq/vis_files/karman_animate.plot

@@ -1,12 +1,13 @@
 unset border; unset tics; unset key;
-set term gif animate delay 20
+set term gif animate delay 10
 set output "trace.gif"
 set xrange [0:30]
 set yrange [0:4]
-set object 1 circle front at 4.0,2.0 size 1.0 fillcolor rgb "black" lw 2
+set size ratio -1
+set object 1 circle front at 5.0,2.0 size 1.0 fillcolor rgb "black" lw 2
 
 
-do for [ts=0:300] {
-    plot "particles_".ts.".dat" with points pointtype 7
+do for [ts=0:500] {
+    plot "particles_".ts.".dat" with points pointtype 7 pointsize 0.3
 }
 unset output