2013 Lubbock Lecture - Phoenics

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4/35. The Past: CFD at IC MED;How we stumbled into itLubbock,TexasOct 18 2013Applications of CFDPrior to 1965, IC Mech Eng still used integral-profilemethods for 2D boundary-layer flows.Profiles were polynomials, with coefficients deducedfrom weighted-integral conservation equations.Then the Eureka-insight flash: piece-wise-linearprofiles were more flexible; with integration over‘pieces’; i.e. with unity weighting factors.We had invented (our own kind of) finite-volumeCFD.The rest is history.A remark aside: The finite-element community still usesnon-unity weighting factors; to their great disadvantage.One day they’ll learn. More about this later.
5/35. The Past at IC MED:Features of the first computerprogramLubbock,TexasOct 18 2013Applications of CFDIt first appeared in Patankar’s PhD Thesisof 1967, later published as a book.It simulated 2D parabolic flows, usingaxial distance and dimensionless streamfunction as co-ordinates, so minimisingfalse diffusion.The grid width expanded and contracted to cover onlythe region of interest. So it was ‘self-adaptive’.It handled turbulence via Prandtl’s mixing-length model.Wall functions made their first appearance in it.It used the TDMA, without iteration, for cross-streamsolution; and it ‘marched’ in the main-flow direction.
Page 1 and 2: 1/35. Past, present & future ofCFD:
Page 3: 3/35. The Past: Is the pre-digitalm
Page 7 and 8: 7/35. The Past at IC MED:SIVA, SIMP
Page 9: 9/35. The Past at IC MED:More about
Page 16: 16/35. Pressure distribution in gas
Page 19 and 20: 19/35. Present trends:grids for arb
Page 21 and 22: 21/35. Present trends:SPARSOL (Stru
Page 23 and 24: 23/35. Present grid trends:How Xcel
Page 25 and 26: 25/35. Present: turbulence-modeltre
Page 27 and 28: 27/35. Turbulence trends:Mixing fol
Page 29 and 30: 29/35. The future - perhaps.Models
Page 31 and 32: 31/35. The future - perhapsWill gen
Page 33 and 34: 33/35. The future - perhaps:Partial
Page 35: 35/35. The future - perhaps:Terrest

2013 Lubbock Lecture - Phoenics

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