flux

Posted 2021-02-16 code-saturne

 

 

Flux

Table of Contents

• 1. flux
  • 1.1. flux vs vector

1 flux

flux

quantity per unit time per unit area, quantity/(time*area)

(no term)

Quantities that can be fluxed in fluids include fluid mass, momentum, energy, etc.

There are three fundamental mechanisms of flux of interest in fluid mechanics:

• convective flux
• diffusive flux
• radiative flux
• the quantity is carried with the flow
• the quantity migrates from zones of high concentration to zones of low concentration by random molecular motion
• the quantity (e.g. heat) is carried by waves such as electromagnetic waves (in the infrared spectrum in the case of heat).

Flux examples:

• ( ho mathbf{v} ) : mass flux
• ( ho u mathbf{v} ):flux of x component of momentum
• ( ho v mathbf{v} ):flux of y component of momentum
• ( ho e mathbf{v} ):flux of internal energy
• ( ho (e+frac{v^2}{2}) mathbf{v} ):flux of total energy

• diffusion flux= total flux - convective flux

1.1 flux vs vector

• The flux of a vector is a matrix
• The flux of a scalar is a vector

Created: 2019-04-13 周六 02:09

Emacs 25.3.1 (Org mode 8.2.10)

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