CRS4 Contributo a convegno

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https://hdl.handle.net/11050/53
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Mostra il contenuto di CRS4 Contributo a convegno per Subject "automation"

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  • Immagine di anteprima
    Item
    Automated moving mesh techniques in CFD. Application to fluid-structure interactions and rigid motions problems
    (2012-04-11) Profir, Maria Manuela
    In the Computational Fluid Dynamics (CFD) simulation codes, the physical domain is divided into a finite number of small control volumes, corresponding to the cells of a computational grid, where discrete versions of the integral form of the continuum transport equations are applied. For the simulation of the moving meshes (fluids or solids), we employ specific morphing techniques combined with rigid motions. Since morphing strategies can easily lead to poor quality cells, it becomes important to keep under control the topological deformations that can take place both into the surface mesh and into the volume cells, by means of specific mesh quality metrics and re-meshing procedures. The work done in getting the control of the morphing/re-meshing techniques in order to use them in applications that principally treat with fluid-structure interactions and rigid bodies motions is here presented. In such applications, when local deformations of surfaces occur, bad topological effects like warped, twisted or self-intersected faces can easily lead to the appearance of negative volume cells, determining the simulation to stop running. We give a demonstration of how various morphing techniques have been applied to simulations that especially treat with structural and moving parts, in particular, in cases where the deformations arise from considerations related to solid displacements and stresses (pipe's walls vibrations) or to rigid body motions (translations). Surface boundary mesh extraction and CAD geometry updating strategies to avoid mesh degeneration are investigated and developed. Java programming is employed for the automation of the re-meshing procedures.
  • Immagine di anteprima
    Item
    Re-meshing strategies in CFD simulations of moving meshes
    (2012-08-16) Profir, Maria Manuela
    The presence of moving meshes when motions of fluids and solids are being simulated requires a good control of the cells topological deformations. The work done in getting the control of the mesh morphing techniques in Computational Fluid Dynamics (CFD) applications of fluid-structure interactions and rigid bodies motions is here presented. The effects of imposed rigid body motions on a fluid mesh surrounding a solid body are analysed and strategies for maintaining a reasonable quality mesh during its deformation are investigated and developed. Java programming is employed in order to automate the process of re-meshing when the mesh deformation is dangerously close to the degeneration.