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and the "cut-cell" technique


Brian Spalding

NAFEMS lecture, Kenilworth, October 1999


Summary of main themes

  1. Although fluid-flow, thermal and structural analysis are well handled by modern software packages, certain deficiencies remain, of which the chief are:

  2. Some progress is here reported regarding the CAD-to-CFD difficulty, with the STL format proving to be of key importance.

  3. Cartesian grids have many merits; but bodies having curved surfaces do not fit them well.
    However, the PARSOL "cut-cell" technique solves this difficulty.

  4. It will be shown that solid stress and fluid flow can be analysed by a single algorithm, a single code, and therefore a single specialist.

  5. Good compromises between economy and realism for simple circumstances are:

  6. MFM, the "multi-fluid model" of turbulence, promises the same for more complex circumstances, especially those involving chemical reaction.


  1. An overview of computer-aided engineering
  2. CAD to CFD via VR and PARSOL, with a link to Hotbox
  3. SFT: simultaneous Solid-stress, Fluid-flow and Thermal analysis
  4. Modelling turbulence, radiation and chemical reaction
  5. The revival of remote computing
  6. Concluding remarks
  7. References