Hello, can someone give me a hand? I have to do a CFD analysis in Ansys Fluent of a rocket that we are going to manufacture for the student association I belong to. The problem is that the CAD file, as it is designed to be manufactured, has a lot of clearances and holes and when I import the geometry, put the enclosure and extract the geometry, as it has clearances the mesh gets into the gaps. Is there a simple way to change the CAD so that it only takes the outer surface (as if I put a cloth over the Rocket).

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I want to learn Multiphase simulation. Can I get some suggestions how and from where can I learn Multiphase from scratch ?

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Just found a turbulence modelling course on YouTube by professor S.A.E Miller who also has an introduction to cfd course. here is the link to the course for anyone who is interested: https://youtube.com/playlist?list=PLbiOzt50Bx-liph4_pxAdW8Qu4QelSDvo&si=4MEJwkGrOiCfocVh Course objectives stated by professor Miller: A class that covers in depth concepts of the science and mathematics of turbulence modeling with a historical perspective. Examples are given as much as possible involving contemporary approaches. Statistical quantities, averages, correlations, coherence, the Russian school, law of the wall, chaos, compressible NSE, averaging relations, mean kinetic energy, Reynolds stress transport equation, boundary layer equations, two-dimensional in laminar and turbulent flows, mixing length concepts, Baldwin-Lomax, Cebeci-Smith, 1/2-equations, one-equation models, Prandtl’s model, Spalart-Allmarus, k-ω and k-ε, Boussinesq, nonlinear relations, stress transport models, closure, applications and examples, physical considerations, Morkovin hypothesis, studies in particular flows. These topics will be related to turbulent flows that are observed in our daily lives and within various fields of engineering.