From e9fc4014876eaa094be466b8c7fb44807435b42b Mon Sep 17 00:00:00 2001
From: DANG Truong <dangtruong080593@gmail.com>
Date: Sun, 13 Jun 2021 06:12:06 +0700
Subject: [PATCH] add support for Tecplot .dat file (Tecplot 2009 compatible)

---
 FvmMesh2D.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 FvmMesh2D.h   |  1 +
 main.cpp      |  2 +-
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/FvmMesh2D.cpp b/FvmMesh2D.cpp
index 8d5842c..14803ae 100644
--- a/FvmMesh2D.cpp
+++ b/FvmMesh2D.cpp
@@ -380,3 +380,55 @@ void FvmMesh2D::writeVtk() {
     outfile.close();
 }
 
+void FvmMesh2D::writeTecplot() {
+    /* 
+     * Write converted mesh file in Tecplot 2009 compatible format
+     */
+    string str = mshReader.getFname() + ".dat";
+    vector<Point> coordNodes  = mshReader.getCoordNodes();
+    vector<NodeIdent> idNodes = mshReader.getIdNodes();
+    unsigned nbNodes = mshReader.getNbNode();
+    unsigned nbElm = mshReader.getNbElm();
+    ofstream outfile(str);
+
+    outfile.setf(ios::fixed, ios::floatfield);
+    outfile.precision(10);
+    outfile << "VARIABLES=X,Y,CELL_IDENT,NEIGHBOR1,NEIGHBOR2,NEIGHBOR3,NEIGHBOR4" << endl;
+    outfile << "VARIABLES=X,Y" << endl;
+    outfile << "ZONE T=\"UNSTRUCTURED-COUNTOUR\"" << endl;
+    outfile << "ZONETYPE=FEPOLYGON" << endl;
+    outfile << "NODES=" << nbNodes << endl;
+    outfile << "ELEMENTS=" << nbElm << endl;
+    outfile << "FACES=" << nbElm * 4 << endl;
+    outfile << "NumConnectedBoundaryFaces=0" << endl;
+    outfile << "TotalNumBoundaryConnections=0" << endl;
+
+    for (unsigned i = 0; i < nbNodes; i++) {
+	outfile << setw(15) << coordNodes[i].getX() << endl;
+    }
+    
+    for (unsigned i = 0; i < nbNodes; i++) {
+	outfile << setw(15) << coordNodes[i].getY() << endl;
+    }
+
+    /*
+     * Node indexes
+     */
+    for (unsigned i = 0; i < nbElm; i++) {
+        outfile << idNodes[i].getIdNode()[5] << " " << idNodes[i].getIdNode()[6] << endl;
+        outfile << idNodes[i].getIdNode()[6] << " " << idNodes[i].getIdNode()[7] << endl;
+        outfile << idNodes[i].getIdNode()[7] << " " << idNodes[i].getIdNode()[8] << endl;
+        outfile << idNodes[i].getIdNode()[8] << " " << idNodes[i].getIdNode()[5] << endl;
+    }
+
+    for (unsigned i = 0; i < nbElm; i++) {
+        outfile << i + 1 << " " << i + 1 << " " << i + 1 << " " << i + 1 << " " << endl;
+    }
+
+    for (unsigned i = 0; i < nbElm; i++) {
+        outfile << 0 << " " << 0 << " " << 0 << " " << 0 << " " << endl;
+    }
+
+    outfile.close();
+}
+
diff --git a/FvmMesh2D.h b/FvmMesh2D.h
index 45f5fa3..4a51e73 100644
--- a/FvmMesh2D.h
+++ b/FvmMesh2D.h
@@ -25,6 +25,7 @@ class FvmMesh2D {
     void detectNearestNeighbor();
     void calculVol();
     void writeVtk();
+    void writeTecplot();
     
 private:
     GmshReader mshReader;
diff --git a/main.cpp b/main.cpp
index c2237cf..18cd12c 100644
--- a/main.cpp
+++ b/main.cpp
@@ -15,7 +15,7 @@ int main()
 	finiteVolumeMesh.assignFaces();
 	finiteVolumeMesh.assignBoundaryCondition();
 	finiteVolumeMesh.detectNearestNeighbor();
-	finiteVolumeMesh.writeVtk();
+	finiteVolumeMesh.writeTecplot();
 
 	high_resolution_clock::time_point t2 = high_resolution_clock::now();
 	auto duration = duration_cast<seconds>(t2 - t1).count();