CEL help!
Hi All,
I'm trying to define a powerlaw model dynamic viscosity in my material for my transient simulation: μ = μ0*γ^nâˆ'1, μ0=0.35, n=0.6. I created CEL function using the strain rate system variable for γ but CFX-Pre is giving my an error saying some variables should be dimensionless. Can anyone tell me the correct syntax in creating this CEL expression? Many Thanks, CC. |
Re: CEL help!
Dear CC,
Your expression does not have units; therefore the complain. mu0 = 0.35 [units of viscosity] n = 0.36 mu = mu0 * (sstrnr/(1[s]))^(n-1) Notice that the shear strain rate is divided by 1[s] scale to prevent the units of mu0 to be a function of "n".. Besides that, there are some bounding issues with power law viscosity models you must deal with. What happens when the shear strain rate is 0. A divide by zero will occur. Have you looked at tutorial 11: Non-Newtonian Fluid Flow in an Annulus.. All the correct details are in there. Opaque. |
Re: CEL help!
Hi Opaque,
Where can I find the tutorial 11? Thanks, CC. |
Re: CEL help!
Dear CC,
It is part of the main documentation.. Select Help in any of CFX-Pre/Solver/Post and search for non Newtonian.. Opaque |
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