Learning Forum

[smalbro93]

I have seen a lot of Fluent Users changing Density and Dynamic Viscosity Values (for the fluid) in Material Property to get the desired Reybold's number.nRe = density x Velocity x D / Dyn. Viscousity nIn my case, I keep density = 1 (Edit Fluid material property) and Velocity = 1 (Initialization and Inlet velocity) with D = 0.1 (geometry) to get a Dyn. Viscosity value that corresponds to my desired Re.nNow what I am worried about is, do I also need to change these values in the Reference Values Section? Since I am interested in getting the correct Cd, Cl, Pressure Coef. ... valuesnI know that I need to change the Area to 0.1 (2D) but how about the density here and the Dynamic Viscosity?n n

[Rob]

If you want the coefficients to give the correct value you'll need to adjust the reference values. They're defined in the User's Guide so you'll know what to change based on the equations. n

[smalbro93]

Thank you Rob.n

[smalbro93]

My doubt was that since we change the density and viscosity to adjust for Re, we know that we use density for Force Coefficients calculation. Do we assign the changed value or keep the density value as the standard value in the Reference section, is what I want to ask. Thank you.n

[Amine Ben Hadj Ali]

'You use the values you are using in your solving part. So adjust them as you are adjusting the material properties!n

[smalbro93]

Thank you. Understood!n