open TELEMAC-MASCARET The mathematically superior suite of solvers

Hi, everyone

I have encountered a problem. ve. I want to solve an advection–diffusion equation but the velocity and turbulence fields are provided by my data.

Then I think I should modify the telemac2d.f, and if I comment all the subroutine like compute the advection, the diffusion of velocity, and read the velocity and turbulence fields from exterior. But a lot of problems arise. ICan everybody tell me what can I do ?

Hello,

You have an example in telemac2d, called "cone", that uses an emptied version of propag.f that does nothing, and the velocity field and depth is actually given by the initial conditions done in subroutine condin.f. You can inspire from this: your version of propag will give the data of velocity and depth.

However if you give a velocity field and depth from another program, the continuity equation may be approximately solved and you will certainly have problems of mass conservation and monotonicity.

With best regards,

Jean-Michel Hervouet

Thank you JMH,
First, I use the telemac2d hydrodynamic model to generate the velocity and turbulence fields as usual, and the intermediate results are stored. Then I want to use the the speed of the opposite number(-u) and turbulence fields to solve the tracer transport equation. So in the second step, I don't want the continuity equation and momentum equations to be approximately solved.
I will look for the example you said. Thank you!

Dear JMH,
Sorry, I don't find the example called ''cone'',Do you mean any other example?

Hello,

cone is in the examples of version 7.0 actually, in the telemac2d folder, so probably you work with an earlier version. I enclose the Fortran file of this case.

JMH

Thank you very much. I will refer to this example.Thank you