how to monitor the heat flux or momentum flux along some boundary region.
Dear users, I don't have a complete answer to this question but I am trying to do a similar thing: I have a convective heat transfer problem and I want to evaluate the integral of the normal derivative of temperature along one boundary (Nusselt number). Ideally I'd like to do this at regular intervals during the simulation but there does not seem to be a filter that does this. I have been able to compute the Nusselt number for individual simulations (I use fieldconvert -m gradient, see p.96 of v5.0.0 user guide, then I export a 1D cross section of the data at the boundary via ParaView and do the quadrature myself) but I wonder whether there is a more efficient method that's more "internal" to Nektar++? One other question I have: does the scalargradient option in fieldconvert give the normal derivative at the boundary? Many thanks, Ed Threlfall. On Mon, Feb 8, 2021 at 11:55 AM ztdepyahoo <ztdepyahoo@gmail.com> wrote:
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Dear sir: I am using netkar 4.5 for natural convection problem. I want to know how to monitor the heat flux or momentum flux along some boundary region.
Regards
ztdepyahoo ztdepyahoo@gmail.com
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HI Ed, I am not aware of any function that can be called directly as things stand. However it would be possible to introduce a new filter to do this if you fancied having a go at developing one? I believe that scalargraident just returns the standard gradient operator so it would only give the normal derivative if the boundary were aligned with the x,y or z direction. Cheers, Spencer. On 10 Feb 2021, at 10:48, Edward Threlfall <ejthrelfall@gmail.com<mailto:ejthrelfall@gmail.com>> wrote: Dear users, I don't have a complete answer to this question but I am trying to do a similar thing: I have a convective heat transfer problem and I want to evaluate the integral of the normal derivative of temperature along one boundary (Nusselt number). Ideally I'd like to do this at regular intervals during the simulation but there does not seem to be a filter that does this. I have been able to compute the Nusselt number for individual simulations (I use fieldconvert -m gradient, see p.96 of v5.0.0 user guide, then I export a 1D cross section of the data at the boundary via ParaView and do the quadrature myself) but I wonder whether there is a more efficient method that's more "internal" to Nektar++? One other question I have: does the scalargradient option in fieldconvert give the normal derivative at the boundary? Many thanks, Ed Threlfall. On Mon, Feb 8, 2021 at 11:55 AM ztdepyahoo <ztdepyahoo@gmail.com<mailto:ztdepyahoo@gmail.com>> wrote: This email from ztdepyahoo@gmail.com<mailto:ztdepyahoo@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<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Dear sir: I am using netkar 4.5 for natural convection problem. I want to know how to monitor the heat flux or momentum flux along some boundary region. Regards <https://maas.mail.163.com/dashi-web-extend/html/proSignature.html?ftlId=1&name=ztdepyahoo&uid=ztdepyahoo%40gmail.com&iconUrl=https%3A%2F%2Fmail-online.nosdn.127.net%2Fsmac21b248a56949de9f08898ddfa22c2b.jpg&items=%5B%22ztdepyahoo%40gmail.com%22%5D> [https://mail-online.nosdn.127.net/smac21b248a56949de9f08898ddfa22c2b.jpg] ztdepyahoo ztdepyahoo@gmail.com 签名由 网易邮箱大师<https://mail.163.com/dashi/dlpro.html?from=mail81> 定制 _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users
participants (3)
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Edward Threlfall
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Sherwin, Spencer J
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ztdepyahoo