The Things We Does Know Phil Roe 1 1 Department of Aerospace - - PowerPoint PPT Presentation

the things we does know
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The Things We Does Know Phil Roe 1 1 Department of Aerospace - - PowerPoint PPT Presentation

The Things We Does Know Phil Roe 1 1 Department of Aerospace Engineering University of Michigan Conference on CFD Futures Hampton Virginia 2012 Phil Roe The Things We Does Know Artemus Ward (1834-1867) wrote that It aint the things you


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SLIDE 1

The Things We Does Know

Phil Roe1

1Department of Aerospace Engineering

University of Michigan

Conference on CFD Futures Hampton Virginia 2012

Phil Roe The Things We Does Know

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SLIDE 2

Artemus Ward (1834-1867) wrote that “It ain’t the things you dont know in life as gets you into trouble; it’s the things you does know as ain’t actually so.”

Phil Roe The Things We Does Know

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Evolution of CFD

In 1974, when I first got involved in CFD, the most advanced method avaliable to industry was a second-order finite-volume method. In 2012, the most advanced method available to industry is .... A second-order finite volume method Of course, there have been many advances

Unstructured and/or adaptive grids Physically-motivated flux functions (Fairly) fast implicit/multigrid solvers

And along the way, there have been significant mutations, like the move to semi-discrete methods

Phil Roe The Things We Does Know

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SLIDE 4

Evolution of CFD

In 1974, when I first got involved in CFD, the most advanced method avaliable to industry was a second-order finite-volume method. In 2012, the most advanced method available to industry is .... A second-order finite volume method Of course, there have been many advances

Unstructured and/or adaptive grids Physically-motivated flux functions (Fairly) fast implicit/multigrid solvers

And along the way, there have been significant mutations, like the move to semi-discrete methods

Phil Roe The Things We Does Know

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SLIDE 5

Evolution of CFD

In 1974, when I first got involved in CFD, the most advanced method avaliable to industry was a second-order finite-volume method. In 2012, the most advanced method available to industry is .... A second-order finite volume method Of course, there have been many advances

Unstructured and/or adaptive grids Physically-motivated flux functions (Fairly) fast implicit/multigrid solvers

And along the way, there have been significant mutations, like the move to semi-discrete methods

Phil Roe The Things We Does Know

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SLIDE 6

Evolution of CFD

In 1974, when I first got involved in CFD, the most advanced method avaliable to industry was a second-order finite-volume method. In 2012, the most advanced method available to industry is .... A second-order finite volume method Of course, there have been many advances

Unstructured and/or adaptive grids Physically-motivated flux functions (Fairly) fast implicit/multigrid solvers

And along the way, there have been significant mutations, like the move to semi-discrete methods

Phil Roe The Things We Does Know

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SLIDE 7

Evolution of CFD

In 1974, when I first got involved in CFD, the most advanced method avaliable to industry was a second-order finite-volume method. In 2012, the most advanced method available to industry is .... A second-order finite volume method Of course, there have been many advances

Unstructured and/or adaptive grids Physically-motivated flux functions (Fairly) fast implicit/multigrid solvers

And along the way, there have been significant mutations, like the move to semi-discrete methods

Phil Roe The Things We Does Know

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SLIDE 8

Path-dependent evolution

There is nothing unique about evolutionary design. At best it yields a local optimum. The local optimum that you end up in will depend on the path you took to get there; if you have fishlike ancestors you will have fishlike features. The skeletons of current CFD codes reveal their evolutionary trajectory.

Phil Roe The Things We Does Know

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Four things we does know

The Euler equations can be closed by assuming an equilibrium equation of state (Zaide) The Navier Stokes equations are a parabolic system (Nishikawa) Residuals must be eliminated (Caraeni) A flux flows through a surface (Roe) The purpose of these talks is to to question some of our cherished assumptions, in preparation for the revolution. They are NOT intended to present a unified vision of CFD

  • r anything else. That comes on Friday ;-)

Phil Roe The Things We Does Know