Posted Thu, 15 Dec 2016 07:23:56 GMT by Alex Costall PhD Student
"In transport models, the elemental distribution Péclet Number is available which can be used to check whether the spatial discretization is sufficiently fine for a specific transport problem."

I'm struggling to find more information on this topic. What dictates 'sufficiently fine' as far as Peclet numbers are concerned?

Is lower or higher better....?!
Posted Thu, 15 Dec 2016 08:47:38 GMT by Björn Kaiser
The finer the mesh the lower the Péclet number. As a very rough rule of thumb the literature often said that the grid Péclet number should not exceed a value of 2. From my experience, I do not always insist to satisfy a number smaller than 2. Other factors as such as the type of physical problem (e.g. linear non-linear), the degree of required accuracy, computational resources may also play a role in the mesh design. Anyway, the Péclet provides a useful quantitative measure on whether or not the mesh is fine enough for a transport model.
Posted Fri, 16 Dec 2016 00:14:42 GMT by Alex Costall PhD Student
Great - thankyou!

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