movemesh.edp

FreeFem++可以生成高质量的有限元网格。可以用于流体力学

// simple movemesh example
mesh Th=square(10,10);
fespace Vh(Th,P1); 
real t=0;
// ---
//  problem is how to build data without interpolation
//  so the data u is moving with the mesh hse you can see in the plot
// ---
Vh u=y;
for (int i=0;i<4;i++)
{ 
 t=i*0.1;
 Vh f= x*t;
 real minarea=checkmovemesh(Th,[x,y+f]);
 if (minarea >0 ) //  the movemesh will be ok
   Th=movemesh(Th,[x,y+f]);
 cout << " Min area  " << minarea << endl;
//  u=(Vh,u[]);  // the new syntaxe  FH
 Vh tmp;     // =u[],  sorry no init of FEspace function with array. 
 tmp[]=u[];  //save the value  
 u=0;        // to change the FEspace and mesh  associated to u
 u[]=tmp[];  // set le value of the array without no mesh update 
 plot(Th,u,wait=1);
};
//  remark, in this programme we have no solution with link to a previous mesh
// so all the previoux are delete in memory
//   --------