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Mesh Topology Influence on Volute Aerodynamic Performance Computed Using Code Leo

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[27 Aug 2014] Volute designs present a challenging geometry for meshing. Multi-block structured meshing has the advantage of reducing numerical diffusion and a higher node to cell count ratio, making it attractive for problems where accurately predicting performance is key. However, volute features like that of the tongue region, require a significant amount of effort to obtain a purely hexahedral mesh. Volute performance simulations depend critically on the cells nearest the boundary, as the core of the flow typically has relatively low circulation, implying hybrid meshing could potentially provide similar accuracy with more automation.

In this webinar, we evaluate a generic volute design. Simulations were performed using Code Leo, a computational fluid dynamics (CFD) solver developed by AeroDynamic Solutions (ADS), on three different grid types generated with Pointwise: multi-block structured, unstructured with a hexahedral boundary layer, and unstructured with a prismatic boundary layer. We will describe the process for generating each grid, and discuss their relative pros and cons regarding meshing time and ease of modification. In addition, we will evaluate the numerical solutions from each of the three mesh topologies for accuracy and overall solution turnaround time.

Discover how to:

  • Design a fully structured mesh topology for a generic volute geometry and use the elliptic solver to improve cell quality.
  • Strategically create a structured surface mesh that promotes high quality unstructured hexahedral extrusions.
  • Rapidly generate unstructured surface meshes and viscous volume meshes using T-Rex (anisotropic tetrahedral extrusion).
  • Compare different mesh topologies for solution accuracy.
  • Compare and contrast mesh topologies to suit your application.

Video


Images

comparing 3 volute meshes

AeroDynamic Solutions and Pointwise teamed up to compare simulation results on the same geometry using three different gridding techniques (from back to front): fully structured (hexahedral), unstructured with extruded hexahedral boundary layer, and unstructured with extruded prismatic boundary layer.

Files for Download


Pointwise-Webinar-Mesh-Topology-Influence-on-Volute-Aerodynamic-Performance
Description Format File Name File Size [MB]
Webinar Video WMV Pointwise-Webinar-Mesh-Topology-Influence-on-Volute-Aerodynamic-Performance .wmv 240
Volute Geometry Parasolid binary VoluteGeometry.x_b 0.1
Script to create O-H toplogy Glyph CreateOH.glf  
Script to a structured domain from 3 connectors Glyph TriQuad.glf