Timestep has changed between runs with the same lb/fluid

Hi I’m implementing lattice Boltzmann on my system. I get a warning in the log scripts. But It’s running. However, it’s very slow. Can you tell me what is warning about?

WARNING: Timestep has changed between runs with the same lb/fluid. Unphysical results may occur (…/fix_lb_fluid.cpp:570)

thanks in advance for your help.

Hi I'm implementing lattice Boltzmann on my system. I get a warning in the
log scripts. But It's running. However, it's very slow. Can you tell me what
is warning about?

slow compared to what? such a vague statement is

WARNING: Timestep has changed between runs with the same lb/fluid.
Unphysical results may occur (../fix_lb_fluid.cpp:570)

this means what it says, i.e. that you have changed the time step for
the LB fluid time integration between two run commands.

axel.