Traditional, quantitative simulation based on quantitative models aims at producing precise numerical results as answers to user’s questions about the problem domain. Such precise numerical answers are often overly elaborate, and they contain much more information than it is actually needed. In every day life, humans use common sense to reason about problems qualitatively, without numbers. In t...

We review the numerical modelling of the nonlinear pulsations of classical variable stars with hydrocodes that include the effects of turbulent convection. Despite their simplicity these turbulent convective recipes appear to remove many of the difficulties that radiative codes faced. In particular, the numerical modelling of double mode pulsations has become possible.

This work investigates the problem of distinguishing modelling assumptions and numerical errors in sparseLagrangian FDF (Filtered Density Function) methods. A new interpretation of sparse modelling with Curl’s mixing, which does not require an additional observation scale nor filtering, is given. The diffusion effects induced by mixing, which were previously interpreted as numerical errors, are...