Modeling > Modeling Flow and Energy > Field Functions Reference

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Field Functions Reference

The following primitive field functions are made available to the simulation when the following models are used:

The descriptions indicate (in brackets) if the field function is available through a flow or energy model. These objects all have the same base properties, with some field functions also having reference value properties (indicated by a ref subscript in the following descriptions).

Pressure

The gauge pressure. The quantity in Eqn. 38. (Flow)

   

Total Pressure

The pressure obtained by isentropically bringing the flow to rest. (Flow)

   

Relative Total Pressure

The pressure obtained by isentropically bringing the flow to rest in the relative frame of motion. (Flow)

   

Absolute Pressure

The sum of the pressure and the operating pressure. (Flow)

   

Pressure Coefficient

The value defined as where , and are the reference pressure, density and velocity, respectively. (Flow)

   

Total Pressure Coefficient

The value defined as where , and are the reference pressure, density and velocity, respectively. (Flow)

   

Velocity

The velocity vector field. (Flow)

   

Mass Imbalance

The imbalance of mass in any cell, defined as for each cell. (Flow)

   

Mass Flux

The face mass flux, . (Flow)

   

Flow Angle

The boundary flow angle, . (Flow)

   

Wall Shear Stress

The wall shear stress vector, defined at a wall face as , where is the stress tensor (see coupled viscous fluxes or segregated viscous fluxes). (Flow)

   

Skin Friction Coefficient

Defined as where and are the reference density and velocity, respectively. (Flow)

   

Total Temperature

The temperature obtained by isentropically bringing the flow to rest. (Energy)

   

  Relative Total Temperature

The temperature obtained by isentropically bringing the flow to rest in the relative frame of motion. (Energy)

   

Boundary Heat Transfer

The heat transferred at the boundary, defined as . (Energy)

   

Boundary Heat Flux

The magnitude of the heat flux vector normal to the boundary, defined as . (Energy)

   

Effective Conductivity

The effective thermal conductivity given by where is the turbulent Prandtl number. (Energy)

   

Heat Transfer Coefficient

The wall boundary heat transfer coefficient defined by where is the wall boundary temperature and is the specified reference temperature in the continuum. (Energy)

   

Local Heat Transfer Coefficient

The local heat transfer coefficient defined by where is the cell temperature and is the wall temperature. This serves as a local measure of heat transfer that does not require a reference temperature as does Heat Transfer Coefficient. (Energy)

   

Nusselt Number

The non-dimensional heat transfer coefficient , where is the heat transfer coefficient, is the thermal conductivity and is the specified reference length in the continuum. (Energy)

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