 The calculations are based on empirical correlations and may still require iterations to meet Y^{+} requirements
 The calculation is based on fullydeveloped regime. In developing regime, coarse mesh is required and hence the estimated mesh height will hold true for developing region also.
 The calculation is applicable to TURBULENT flows only
 The material properties (viscosity and density) are calculated based on specified fluid
 The mesh requirements are different for vertexbased formulations (CFX) and cellcentred formulations (Fluent & STAR CCM+)
 For identical mesh, boundary conditions and material properties, CFX will result in Y^{+} value approx. twice of that in Fluent, if Y^{+} ≥ 30 everywhere
 If Y^{+} of flow results in a range 10 ~ 30, the value reported in CFX will not be closer to twice that reported in Fluent. This is because of "scalable" formulation in CFX.
 For 2D geometries, a thickness of 1.0 [m] is assumed to estimate velocity from specified volumetric or mass flow
 The steps required to estimate the first layer height is described below:

In order to demonstrate the effect of the cellbased and vertexbased scheme, simulations were
performed using same mesh, material properties, solver and boundary conditions.
The areaaveraged value of Yplus matched the observations described above.
The mesh used is shown below.
 The diameter is 100 [mm] and
 the 1st layer height used in CFD simulation is 1.0 [mm]
The material properties used in CFX and Fluent are described below.
The turbulence model used are:
The good level of convergence was achieved:
The calculation was repeated in CFX using velocity profile specified by exponential function V
_{0}*[1(r/R)
^{7}] keeping all other parameters constant. The reported value of Yplus has reduced from 33.2 to 24.2.
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