# 7.13. Global Constants

This section is referenced in the following other sections

- Simulation Setup: Radiation

## 7.13.1. Global Constants

Scope

  Sierra

Summary

  Set of universal constants for a simulation.

    begin Global Constants empty

       Faradays Constant {=} Faraday

       Gravity Vector {=} Gravity1 Gravity2 Gravity3

       Ideal Gas Constant {=} Sigma

       K-E Turbulence Model Parameter Param {=} Value

       K-W Turbulence Model Parameter Param {=} Value

       Les Turbulence Model Parameter Param {=} Value

       Light Speed {=} LightSpeed

       Planck Constant {=} PlanckConstant

       Stefan Boltzmann Constant {=} Sigma

       Turbulence Model Param Number {=} Value

    end Global Constants empty

### 7.13.1.1. Line Commands

###### Faradays Constant

Syntax

  Faradays Constant {=} Faraday

Summary

  Faraday’s Constant. NOTE: Another Faraday’s constant value can be specified while using certain code capabilities. This global constants value will be discarded for any other specified Faraday’s constant values.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Faraday | real | –

###### Gravity Vector

Syntax

  Gravity Vector {=} Gravity1 Gravity2 Gravity3

Summary

  Gravity constant in vector form, acceleration components.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Gravity | real1 real2 real3 | –

###### Ideal Gas Constant

Syntax

  Ideal Gas Constant {=} Sigma

Summary

  Ideal gas constant. NOTE: Another ideal gas constant value can be specified while using certain code capabilities. This global constants value will be discarded for any other specified ideal gas constant values.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Sigma | real | –

###### K-E Turbulence Model Parameter

Syntax

  K-E Turbulence Model Parameter Param {=} Value

Summary

  RANS turbulence model parameters.

Parameter | Value | Default
--- | --- | ---
Param | string | –
{=} | {= | are | is} | –
Value | real | –

###### K-W Turbulence Model Parameter

Syntax

  K-W Turbulence Model Parameter Param {=} Value

Summary

  RANS turbulence model parameters.

Parameter | Value | Default
--- | --- | ---
Param | string | –
{=} | {= | are | is} | –
Value | real | –

###### Les Turbulence Model Parameter

Syntax

  Les Turbulence Model Parameter Param {=} Value

Summary

  LES turbulence model parameters.

Parameter | Value | Default
--- | --- | ---
Param | string | –
{=} | {= | are | is} | –
Value | real | –

###### Light Speed

Syntax

  Light Speed {=} LightSpeed

Summary

  Speed of Light. Depending on the units involved in the specific problem by the user, this value will differ.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
LightSpeed | real | –

###### Planck Constant

Syntax

  Planck Constant {=} PlanckConstant

Summary

  Planck Constant. Depending on the units involved in the specific problem by the user, this value will differ.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
PlanckConstant | real | –

###### Stefan Boltzmann Constant

Syntax

  Stefan Boltzmann Constant {=} Sigma

Summary

  Stefan-Boltzmann constant. Depending on the units involved in the specific problem by the user, this value will differ.

Parameter | Value | Default
--- | --- | ---
{=} | {= | are | is} | –
Sigma | real | –

###### Turbulence Model

Syntax

  Turbulence Model Param Number {=} Value

Summary

  Turbulence model Schmidt and Prandtl numbers

Parameter | Value | Default
--- | --- | ---
Param | string | –
{=} | {= | are | is} | –
Value | real | –