[Pasar]

Hi, everyone!
In the controlDict you can use a function that is defined to give force on the body I want to ask a question about CofR,
I know that CofR is a center of rotation.
if the Body moves down, how should I set the Cof, still keep a fixed value? Can anyone help me solve the question?

PHP Code:

    forces
    {
        type            forces;
        libs            (forces);
        patches         (body);
        rhoInf          997;
        log             on;
        writeControl    timeStep;
        writeInterval   1;
        CofR            (a b c);

    } 


[Bloerb]

It's the point around which your torque will be calculated. Hence if you are only interested in the forces enter whatever maybe (0 0 0). You can calculate the center of gravity of an stl file with the tool surfaceInertia. So depending on your problem you might want to use that.


But if you enter (0 0 0) you can obviously always transform that by hand into another point since you will have the torque and force as output.

[Pasar]

Originally Posted by Bloerb

It's the point around which your torque will be calculated. Hence if you are only interested in the forces enter whatever maybe (0 0 0). You can calculate the center of gravity of an stl file with the tool surfaceInertia. So depending on your problem you might want to use that.


But if you enter (0 0 0) you can obviously always transform that by hand into another point since you will have the torque and force as output.

Thank you Bloerb for your explanation.
I have a body falls down into the water, so
I want to calculate the pressure of water on the body.