- **CFX**
(*http://www.cfd-online.com/Forums/cfx/*)

- - **scalar advection-diffusion equation
**
(*http://www.cfd-online.com/Forums/cfx/18478-scalar-advection-diffusion-equation.html*)

scalar advection-diffusion equation
Hello everybody
In the Solver-Manual of CFX-4.2, the Navier-Stokes equation is transformed to scalar advection-diffusion equations. I'm confused with the energy equation. How is the diffusion term defined in the energy equation? What is the scalar variable in energy equation? Enthalpy? or temperature? |

Re: scalar advection-diffusion equation
The scalar in the energy equation is the specific enthalpy h. Therefore the diffusion coefficient is the heat conductivity lambda. By transfornation of the enthalpy equation to a temperature equation you will have the temperature diffusivity in the diffusion term.
The scalar advection-diffusion equation is teh general form for the PDE of NSE. So it is then a bit more easy to add yr own equation... sascha |

All times are GMT -4. The time now is 03:38. |