# Approximation Schemes for convective term - structured grids - definitions

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== definition of considered face, upon wich approximation is applied == | == definition of considered face, upon wich approximation is applied == | ||

- | usually (in the most articles) west face | + | usually (in the most articles) west face <math> |

- | \boldsymbol{w} </math> is considered | + | \boldsymbol{w} </math> of the control volume is considered ''without loss of generality'' |

for which '''flux is directed from the left to the right''' i.e. <math> \boldsymbol{U_{f} \triangleright 0 } </math> | for which '''flux is directed from the left to the right''' i.e. <math> \boldsymbol{U_{f} \triangleright 0 } </math> | ||

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Bear in mind this stencil | Bear in mind this stencil | ||

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+ | <i> Return to [[Numerical methods | Numerical Methods]] </i> | ||

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+ | <i> Return to [[Approximation Schemes for convective term - structured grids]] </i> |

## Latest revision as of 01:14, 9 November 2005

## Contents |

## Goals of this section

Here we shall develop a commone definitions and regulations because of

- in different issues was used different definitions and notations
- we are searching for common approach and generalisation

**Please note:** *as we still developing this section, you can find the rest of non-unificated definitions*

## Usual used definition for convected variable

we shall use here

## definition of considered face, upon wich approximation is applied

usually (in the most articles) west face of the control volume is considered *without loss of generality*

for which **flux is directed from the left to the right** i.e.

we shall define it as

and convected variable at face of CV as

also you can find in literature such definition as , but we suggested it non suitable, because of complication

## indicators of the local velocity direction

approximation scheme can be written in the next form

| (1) |

where and are the indicators of the local velocity direction such that

| (1) |

| (1) |

and of course

| (1) |

also used such definitions as and

we offer to use

and

therefore unnormalised form of approximation scheme can be written

| (1) |

or in more general form

| (1) |

## definitions for NV diagram

we discovered such definitions as

is a function of

is a function of

we shall use here

is a function of

## node stencil

Bear in mind this stencil

* Return to Numerical Methods *

* Return to Approximation Schemes for convective term - structured grids *