Mesh near wall is very critical to capture boundary layer physics in CFD. This Y Plus / Y+ calculator gives first mesh cell height required for desired Y+ value selected based on turbulence model wall treatment.

This Y plus calculator gives first cell / grid height based on input values of free stream velocity, density and viscosity of working fluid, and a reference length. The desired wall Y+ value in the solution. These calculations are based on flat-plate boundary layer theory.

Before getting into the details of the turbulent models let us discuss an important concept known as and know how it is related to turbulence modeling, mesh generation process and how it is going to affect the CFD end result. It is important to know about the concept of wall or in general how the flow behaves near the wall, to consider the effects near the wall as it is the basis on which choice of the turbulence model is governed.

When modelling turbulent flows in CFD, turbulence models require the specification of turbulence variable values at the inlet boundaries. There are several ways to provide turbulence parameters at boundaries. This calculator gives all the turbulence values based on inlet conditions like velocity or mass flow rate, inlet area and fluid properties. It calculates all turbulence values like Turbulent Kinetic Energy (), Turbulent Dissipation (), Specific Rate of Dissipation (), Turbulent Viscosity Ratio (), Turbulence Intensity () and Turbulence Length Scale ().

Understanding the turbulent behaviour of fluids is one of the most fascinating, forbidding & critical problems in all of classical physics. Turbulence is omnipresent, as most of the fluid flows are turbulent in nature right from the microscopic level at interior of biological cells to the macroscopic scales of the geophysical and astrophysical phenomena including planetary interiors, oceans and atmospheres that represent the dominant physics of turbulent fluid flows.

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