I want to compute the reynolds number for a Nozzle. The information I have at nozzle exit conditions is

Mach number M=0.90,

Velocity U=285 m/s,

Total Temp. T0=290K,

Diameter D=0.56 in,

Lip thickness 0.03 in.

Can anyone please help me in finding the Reynolds number... Can I just go by the Re based on diameter?

I want to find the first grid point distance from the wall for the grid representing the flow inside the nozzle.

Thanks, Shyam

Mr. Shyam Re=rho*U*D/Mu, So you need to know about properties of fluid i.e Mu. Assuming the flow in nozzle is quasi one dimensional calculate the Re using above expression.

But, is it ok to assume the nozzle as quasi one-dimensional nozzle? My doubt was, in case of turbulent boundary layers, is the Re calculation still applicable, or there are other forumulations?

In order to assess whether you can assume a 1-D flow, we need more info about the shape of the nozzle. Is it conical, fluted ??? Also, assuming your talking about calculating your y+ value, why would someone come up with a turbulent wall function for a laminar flow? The method you use to calculate y+ depends on the turbulence model you are using. Getting the right y+ value is often an iterative process anyway, so make an estimate based on Re, pull out what y+ is, and adjusted it until you get something sensible.

In order to assess whether you can assume a 1-D flow, we need more info about the shape of the nozzle. Is it conical, fluted ??? Also, assuming your talking about calculating your y+ value, why would someone come up with a turbulent wall function for a laminar flow? The method you use to calculate y+ depends on the turbulence model you are using. Getting the right y+ value is often an iterative process anyway, so make an estimate based on Re, pull out what y+ is, and adjusted it until you get something sensible.