[mpanch13114]

I would like to run a simulation for 600 seconds with Dirichlet boundary condition and 600 to 800 with Neumann Boundary Condition. Is there a way to change the boundary Field and re-run the simulation? Please give exact steps OpenFoam to incorporate this.

[yeharav]

Hi,

Consider using the groovybc (after installing the swak4foam - https://openfoamwiki.net/index.php/I...am/Downloading).

The boundary condition would look like:

    
floor
    {
        type            groovyBC;
        value           uniform (0 0 0); // the value for the first time step. 
    variables         "X=1;";   // Some variables. 
    valueExpression      "X";    // Expression for drichlet
    gradientExpression  "X";    // Expression for drichlet
    fractionExpression     "time() < 600 ? 1 : 0 ";   // 1=Drichlet, 0=Gradient
    evaluateDuringConstruction 1;
    }

First 600 seconds use drichlet, then switch to neumann


See https://openfoamwiki.net/index.php/Contrib/groovyBC
for further information.