Branch Checkpoint

2025-05-01 21:48:47 +02:00
parent 765883ab88
commit 5148069114
20 changed files with 755 additions and 0 deletions
--- a/PoissonSolver/2D-mpi-sq/src/parameter.c
+++ b/PoissonSolver/2D-mpi-sq/src/parameter.c
@@ -0,0 +1,79 @@
+/* Copyright (C) NHR@FAU, University Erlangen-Nuremberg.
+ * All rights reserved.
+ * Use of this source code is governed by a MIT-style
+ * license that can be found in the LICENSE file.    */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+//---
+#include "parameter.h"
+#include "util.h"
+#define MAXLINE 4096
+
+void initParameter(Parameter* param)
+{
+    param->xlength = 1.0;
+    param->ylength = 1.0;
+    param->imax    = 100;
+    param->jmax    = 100;
+    param->itermax = 1000;
+    param->eps     = 0.0001;
+    param->omg     = 1.8;
+    param->rho     = 0.99;
+}
+
+void readParameter(Parameter* param, const char* filename)
+{
+    FILE* fp = fopen(filename, "r");
+    char line[MAXLINE];
+    int i;
+
+    if (!fp) {
+        fprintf(stderr, "Could not open parameter file: %s\n", filename);
+        exit(EXIT_FAILURE);
+    }
+
+    while (!feof(fp)) {
+        line[0] = '\0';
+        fgets(line, MAXLINE, fp);
+        for (i = 0; line[i] != '\0' && line[i] != '#'; i++)
+            ;
+        line[i] = '\0';
+
+        char* tok = strtok(line, " ");
+        char* val = strtok(NULL, " ");
+
+#define PARSE_PARAM(p, f)                                                                \
+    if (strncmp(tok, #p, sizeof(#p) / sizeof(#p[0]) - 1) == 0) {                         \
+        param->p = f(val);                                                               \
+    }
+#define PARSE_STRING(p) PARSE_PARAM(p, strdup)
+#define PARSE_INT(p)    PARSE_PARAM(p, atoi)
+#define PARSE_REAL(p)   PARSE_PARAM(p, atof)
+
+        if (tok != NULL && val != NULL) {
+            PARSE_REAL(xlength);
+            PARSE_REAL(ylength);
+            PARSE_INT(imax);
+            PARSE_INT(jmax);
+            PARSE_INT(itermax);
+            PARSE_REAL(eps);
+            PARSE_REAL(omg);
+            PARSE_REAL(rho);
+        }
+    }
+
+    fclose(fp);
+}
+
+void printParameter(Parameter* param)
+{
+    printf("Parameters:\n");
+    printf("Geometry data:\n");
+    printf("\tDomain box size (x, y): %e, %e\n", param->xlength, param->ylength);
+    printf("\tCells (x, y): %d, %d\n", param->imax, param->jmax);
+    printf("Iterative solver parameters:\n");
+    printf("\tMax iterations: %d\n", param->itermax);
+    printf("\tepsilon (stopping tolerance) : %e\n", param->eps);
+    printf("\tomega (SOR relaxation): %e\n", param->omg);
+}