[icab]

Dear Foamers,

I need to implement fluid damping to the sixDoFRigidBodyMotionRestraints linearSpring class.
I copied, renamed and compiled the new class (linearSpringFluidDamping) and implemented most of the necessary code (worked fine).

However, I need to get access to the instantaneous drag coefficient Cd from forceCoeffs::write() during the calculation of the fluid damping.

So I created a new member function in forceCoeffs.C

double Foam::forceCoeffs::getCdrag()
{
    
    forcesMoments fm = forces::calcForcesMoment();

    scalar pDyn = 0.5*rhoRef_*magUInf_*magUInf_;

    vector totForce = fm.first().first() + fm.first().second();

    scalar dragForce = totForce & dragDir_;

    scalar Cd = dragForce/(Aref_*pDyn);

    return Cd;
}

which returns the drag coefficient (its basically the forceCoeffs::write() function).

How is it possible to get access to this (Foam::forceCoeffs::getCdrag()) function from within the void Foam::sixDoFRigidBodyMotionRestraints::linearSprin gFluidDamping::restrain function from my new class (linearSpringFluidDamping) where I calculate the fluid damping (I tried a lot, but I am not so familiar with C++)?

Kind regards,

icab