Dear Professor Kumar, 

Many thanks for your help.  Having obtained Nektar++ 4.5, I can run your example and I get output resembling your graphic.

Looking at the xml file, it is a bit of a mystery to me how Nektar++ knows that it has to treat the temperature as a linear advection-diffusion problem (is this a default behaviour?).

Anyhow, thanks for the excellent support.

Regards,

Ed.



On Wed, Aug 19, 2020 at 12:39 AM Abhishek Kumar <abhishek.kir@gmail.com> wrote:
Dear Edward,

For Rayleigh-Benard convection, a BodyForce function is applied for the buoyancy term. Presently, it works perfectly with Nektar 4.5, but there is some issue in Nektar 5 for this function. 

I have attached a xml file, which solves the Rayleigh-Benard problem for Pr=0.71 and Ra=5000. Please see section 3.2 of Kumar and Potherat JFM 2020 for the details of validation (attached in this email).

Please download this version nektar++ from the following link

This version corresponds to "Commit b9f26592".

Let me know if you have any further queries.  

With regards
Abhishek 

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Abhishek Kumar

Assistant Professor (Research)

Centre for Fluid and Complex Systems

Coventry University, Coventry CV15FB

The United Kingdom

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On Tue, Aug 18, 2020 at 8:12 PM Edward Threlfall <ejthrelfall@gmail.com> wrote:

This email from ejthrelfall@gmail.com originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list to disable email stamping for this address.

 

Dear users,

I am trying to set up a simulation of Rayleigh-Benard convection in Nektar++.

I have seen a poster by Hossein and Sherwin from last year's workshop which seems to do a similar sort of thing, but, based on my (limited) understanding of the framework, I am not sure how this was done or how to set up something similar myself (e.g. the system is coupled incompressible (?) Navier-Stokes and advection-diffusion; so, was it the case that the two solvers were run with coupling between them?).

I note there is a separate thread running on convection at the moment; I could have emailed the poster's author directly, but perhaps a public discussion of how to set up this type of problem will benefit others too.

Many thanks,

Dr. Ed Threlfall (UKAEA).
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