CWIPI-coupling source terms and Base field values
******************* This email 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. ******************* Hi, I hope everyone is taking precautions against the COVID-19 threat. This is regarding a problem I am facing in a coupled simulation. I am using Acoustic solver in nektar-5 with CWIPI- coupling. The source terms (fluctuating lamb vector) are sent via Openfoam. I am trying to see acoustics due to flow past a cylinder as a test case for the coupling. The lamb vector at the surface of the cylinder is zero (because the velocity is zero due to no slip boundary condition). However, when i try to visualize the force terms in nektar, it displays an unusually high value at the cylinder wall. Further, the base fields are also received from Openfoam. The mean velocities should vanish at the cylinder wall(they are indeed zero in OpenFoam) . But the values are non zero when they are received in nektar. I guess (and correct me if I am wrong) the source of this error is the interpolation from a finite volume grid to spectral grid and the fact that boundary conditions are not satisfied for base fields and source terms. Is there any way by which I can ensure that the base fields as well as the source terms are zero at the solid boundary? Sincerely, Nitish
Hi Nitish, unfortunately, there is currently no possibility to specify boundary conditions for the interpolated fields. While the base flow velocities not being zero at the walls shouldnt have a (notable) affect on the CAA results, the unusually high source terms do. However, this is probably best addressed by refining the CAA near the wall instead of boundary conditions. Can you provide the CFD and CAA resolutions (grid spacing and order) near the wall? Cheers, Kilian Am 23.03.20 um 16:30 schrieb Nitish Arya:
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Hi,
I hope everyone is taking precautions against the COVID-19 threat.
This is regarding a problem I am facing in a coupled simulation. I am using Acoustic solver in nektar-5 with CWIPI- coupling. The source terms (fluctuating lamb vector) are sent via Openfoam. I am trying to see acoustics due to flow past a cylinder as a test case for the coupling. The lamb vector at the surface of the cylinder is zero (because the velocity is zero due to no slip boundary condition). However, when i try to visualize the force terms in nektar, it displays an unusually high value at the cylinder wall. Further, the base fields are also received from Openfoam. The mean velocities should vanish at the cylinder wall(they are indeed zero in OpenFoam) . But the values are non zero when they are received in nektar.
I guess (and correct me if I am wrong) the source of this error is the interpolation from a finite volume grid to spectral grid and the fact that boundary conditions are not satisfied for base fields and source terms.
Is there any way by which I can ensure that the base fields as well as the source terms are zero at the solid boundary?
Sincerely, Nitish
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participants (2)
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Kilian Lackhove
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Nitish Arya