[marsa27]

Hi,
I would to know how do you impose a scalar from a patch?
Then I would simulate in an unsetady simulation the diffusion of this scalar, is it possible to do the cumulated over time of such a scalar at a point?
Thank you

[Opaque]

You should benefit from doing tutorials using additional variables. Look in the documentation for "Additional Variables".

You can select the type of equation that governs the additional variable: transport equation, pure diffusion, or just Poisson equation.

Once you select the equation type, you should provide boundary conditions on the "patches" of interest. The default value is zero flux for walls and required input for inlets.

I read "accumulation over time" as "time integral of < something>" at a given location, correct? If so, you should benefit from reading the feature for monitor points where you can select to monitor the scalar at that specific location as well as the time integral, time average value, etc.

Hope the above helps,

[marsa27]

Originally Posted by Opaque

You should benefit from doing tutorials using additional variables. Look in the documentation for "Additional Variables".

You can select the type of equation that governs the additional variable: transport equation, pure diffusion, or just Poisson equation.

Once you select the equation type, you should provide boundary conditions on the "patches" of interest. The default value is zero flux for walls and required input for inlets.

I read "accumulation over time" as "time integral of < something>" at a given location, correct? If so, you should benefit from reading the feature for monitor points where you can select to monitor the scalar at that specific location as well as the time integral, time average value, etc.

Hope the above helps,

Yes, I wanted to say the time integral of the additional variable in way to do a contour in the space of this integrated additional variable in way to see at the end of the unsteady simulation what are the location in which it is been more present, is it possible?