# How to calculte \Delta t from CFL?

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 March 15, 2005, 18:37 How to calculte \Delta t from CFL? #1 Annie Guest   Posts: n/a Suppose the differential equation is a pure advection equation, \fraction{\partial C}{\partial t} = u \fraction{\partial C}{\partial x} And suppose CFL number is known, how to calculate time step \Delta t? Thanks a lot. Annie

 March 15, 2005, 19:52 Re: How to calculte \Delta t from CFL? #2 agg Guest   Posts: n/a \Delta t = CFL* \Delta x -------------- u

 March 18, 2005, 03:12 Re: How to calculte \Delta t from CFL? #3 florin Guest   Posts: n/a For pure advection equation, the time step will be calculate from next relation: Dt=CFL*(Dx/u) where Dt is time step, Dx is spatial step, 0

 March 23, 2005, 09:05 How to Calculate Delta t for Incompressible prob? #4 Yousuf Guest   Posts: n/a In Compressible Flow Problem We calculate the Time step Value Using CFL Correlation. But in Incompressible Flow Problem How we calculate the Time step?.. What is the Physics Behind that?.. Thanks.... Yousuf

 March 23, 2005, 10:48 Re: How to Calculate Delta t for Incompressible pr #5 Tom Guest   Posts: n/a If the flow is inviscid or you're using an explicit time integration scheme it is calculated exactly the same way in compressible and incompressible flows. The material derivative is a hyperbolic operator which implies a CFL restriction.

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