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what does mean by diffusion?

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Old   June 4, 2007, 06:52
Default what does mean by diffusion?
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Sometimes we are saying that, this scheme is more diffusive, lets say Upwind schme is more diffusive. or implicit beyond CFL> 1 is more diffusive. What does mean by that? Is it more numerical diffusion? Pls reply thanks everybody for taking interest.
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Old   June 4, 2007, 08:23
Default Re: what does mean by diffusion?
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>Is it more numerical diffusion?

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Old   June 4, 2007, 08:43
Default Re: what does mean by diffusion?
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It mean that the physical profile such as density, pressure become broaden even though the discontinuity is too narrow.
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