Test and copy Darshan's instructions

[fabiangabriel]

Test and copy Darshan's instructions

[FabianGabriel]

Hi Andre,

I've run into a bit of a problem getting it to work on the new openFOAM version. After our meeting on Friday I've tried to run the training on both the old mesh by Darshan and my newly created one. On both tries I got the same error:
--> FOAM FATAL IO ERROR: (openfoam-2012)
Entry 'logStdMax' not found in dictionary "/home/y0095063/DRL_py/env/sample_0/trajectory_1/0/U.boundaryField.cylinder"

That happens right at the start and I have not yet found a solution for it.
I have noo real idea what could cause this as this "U.boundaryField.cylinder" file has never existed and to my knowledge is also not mentioned in the code, so I have no idea why it now demands that this file exists.
I've uploaded the current state of tthe DRL_py directory and also 1 example trajectory where you can see the error.

I hope you can help me on this.

Best Regards
Fabian

[AndreWeiner]

Hi Fabian,
the error is raised by OpenFOAM when reading the entries in the 0/U file. Within the definition of agentRotatingWallVelocity, an entry logStdMax is expected (a value for clipping the log of the standard deviation output of the policy network). This entry is missing in the documentation and also in Darshan's base case. To fix this issue, add logStdMax 2.0; to the boundary condition, e.g.:

cylinder
    {
        type            agentRotatingWallVelocity;
        // center of cylinder
        origin          (0.2 0.2 0.0);
        // axis of rotation; normal to 2D domain
        axis            (0 0 1);
        // name of the policy network; must be a torchscript file
        policy          "policy.pt";
        // when to start controlling
        startTime       0.01;
        // how often to evaluate policy
        interval        20;
        // if true, the angular velocity is sampled from a Gaussian distribution
        // if false, the mean value predicted by the policy is used
        train           true;
        // currently ignored
        absOmegaMax     0.05;
        // limit log of standard deviation
        logStdMax 2.0;
    }

Best, Andre

[FabianGabriel]

Hi Andre,

thank you! That did work and it is now running as it should.

Best Regards
Fabian