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Domain immersion technique and free surface computations applied to extrusion and mixing processes

Abstract : This work focuses on the development of numerical techniques devoted to the simulation of mixing processes of complex fluids such as twin-screw extrusion or batch mixing. In mixing process simulation, the absence of symmetry of the moving boundaries (the screws or the rotors) implies that their rigid body motion has to be taken into account by using a special treatment. We therefore use a mesh immersion technique (MIT), which consists in using a P1+/P1-based (MINI-element) mixed finite element method for solving the velocity-pressure problem and then solving the problem in the whole barrel cavity by imposing a rigid motion (rotation) to nodes found located inside the so called immersed domain [1], each subdomain (screw, rotor) being represented by a surface CAD mesh (or its mathematical equation in simple cases). The independent meshes are immersed into a unique backgound computational mesh by computing the distance function to their boundaries [2]. Intersections of meshes are accounted for, allowing to compute a fill factor usable as for the VOF methodology. This technique, combined with the use of parallel computing, allows to compute the time-dependent flow of generalized Newtonian fluids including yield stress fluids in a complex system such as a twin screw extruder, including moving free surfaces, which are treated by a "level set" and Hamilton-Jacobi method [3].
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Contributor : Magalie Prudon Connect in order to contact the contributor
Submitted on : Friday, August 13, 2010 - 11:31:49 AM
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Rudy Valette, Bruno Vergnes, Olivier Basset, Thierry Coupez. Domain immersion technique and free surface computations applied to extrusion and mixing processes. 10th ESAFORM Conference on Material Forming, Apr 2007, Zaragoza, Spain. pp.Pages 1402-1405 - ISBN 0735404143, ⟨10.1063/1.2729711⟩. ⟨hal-00509550⟩



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