y+ and y* values in Fluent
I've been running a nozzle case with a standard k-epsilon turbulence model and when I plot the y+ against the distance down the nozzle, the velus I get range from about 16-35. In the Fluent Theory Guide, it tells me to use a y* > 15 and I believe that y* and y+ are effectively the same.
But, I've now heard that I need a y+ of greater than 30 otherwise the errors get too large.
Does this mean my y+ values have been way too small?
Thanks in advance!
The Fluent Guide says that the range of y+ values for which wall functions are suitable depends on the Reynolds number, but the lower limit lies in the order of y* or about 15, so I went by that definition.
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