How to choose a smoothing length. What are the criteria for choosing smoothing length? Is there a test similar to the convergence tests for the smoothing length.
I know that larger the smoothing lengths longer the simulation time. I know that having too large or too small will give unphysical results. But how can we know that a particular value is an optimal/best-fit value for a model?
I know it is a fundamental question, but I don't have a clear idea about this.
Here is an example. I am currently during a sloshing tank simulation and I calculating the pressure at a particular position of the tank. I simulated for multiple smoothing length coefficients (coefh =1, 1.2, 1.5, 1.7, 2) and compared with the experiment. (blue line is the experimental maxima of the peak pressure and the green line is the experimental minima of the peak pressure).
How can I tell with is the best smoothing length value with and without considering experimental results?
Similarly, how to chose an artificial viscosity value? What are the criteria for choosing one?