BounceBackVelocity

[sahilbhapkar30]

Hello,

I was trying to implement the getbouncebackVelocity dynamics function.

BounceBackVelocity<T,DESCRIPTOR>& getBounceBackVelocity(const double rho, const double u[DESCRIPTOR::d])

I was not able to understand what value should I put in the velocity (u). As my velocity is defined in the vector form using the analytical functor using

T maxVelocity = converter.getCharLatticeVelocity()/100;
AnalyticalConst3D<T,T> uTop(0, 0 ,-maxVelocity);

As the function of BounceBack Velocity is taking a double value, I am confused about the implementation for the velocity.

Could you help me?

Thanking you in anticipation,
Sahil

[Adrian]

I am not sure what you want to accomplish.

Is it simply using the existing Bounce Back Velocity boundary in a simulation?
If so you do not need to implement a getBounceBackVelocity function (?) by yourself, instead call e.g.:

setBounceBackVelocityBoundary(superGeometry, 3, omega, sLattice);
sLattice.defineU(superGeometry, 3, uTop);

in your boundary setup (replace 3 by the material number of your desired bounce back velocity boundary).

[sahilbhapkar30]

Hello,

I tried setting the above Boundary conditions and I received the following error.

error: ‘setBounceBackVelocityBoundary’ was not declared in this scope.

What would be the reason?

Thank you,
Sahil

[Adrian]

This is most likely the same root cause (some mistake in application / compilation setup) as your other issue with setting up bouzidi boundaries. What happens if your write olb::setBounceBackVelocityBoundary?

[Author]

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