******************* 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 all, I have a Quasi-3D simulation of NACA0015 at Rec=40000. My purpose is to verify the aerodynamic forces(lift coefficient, drag coefficient,pressure coefficient). The simulation is run at P=3 and the chord length is 0.12m(AOA=4 degree). In the spectral/hp planes(x-y plane), I generate Quadrilateral elements with ICEM CFD. 20 convective time (T=20C/U) is used to cover the transient phase.Time-averages are subsequently sampled for further 20 convective time. However, something may be wrong with the setting of parameters. The variation of aerodynamic forces in DragLift.fce(attached) become stagnant after few time steps. I also think the flow is not 'started' correctly, I cant see any vortex structures during post-processing, even the convective time is sufficient(attached,NACA0015_4degree_2.5D_0515_9.chk.tar.gz). I put the mesh file (NACA0015_4degree_2.5D_0515.xml, some mesh pictures in mesh_pictures.tar.gz) and setting file(session.xml) in my e-mail. Could you please tell me where the trouble is, the mesh or the setting file? I wish all of you are fine and healthy. Thank you for your help. Kind regards, Zhaoyu Wang Shanghai Jiao Tong University
Hi Zhaoyu, I am cc’ing Ankang who has been running Naca 0012 Aerofoils recently. Hopefully he can have a look to see what might be going on. Cheers, Spencer. Spencer Sherwin FREng, FRAeS Head of Aerodynamics Section, Director of Research Computing Service, Professor of Computational Fluid Mechanics, Department of Aeronautics, s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> South Kensington Campus, Phone: +44 (0)20 7594 5052 Imperial College London, Fax: +44 (0)20 7594 1974 London, SW7 2AZ, UK http://www.imperial.ac.uk/people/s.sherwin/ On 18 May 2020, at 06:27, 王昭予 <clemden@sjtu.edu.cn<mailto:clemden@sjtu.edu.cn>> wrote: ******************* 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 all, I have a Quasi-3D simulation of NACA0015 at Rec=40000. My purpose is to verify the aerodynamic forces(lift coefficient, drag coefficient,pressure coefficient). The simulation is run at P=3 and the chord length is 0.12m(AOA=4 degree). In the spectral/hp planes(x-y plane), I generate Quadrilateral elements with ICEM CFD. 20 convective time (T=20C/U) is used to cover the transient phase.Time-averages are subsequently sampled for further 20 convective time. However, something may be wrong with the setting of parameters. The variation of aerodynamic forces in DragLift.fce(attached) become stagnant after few time steps. I also think the flow is not 'started' correctly, I cant see any vortex structures during post-processing, even the convective time is sufficient(attached,NACA0015_4degree_2.5D_0515_9.chk.tar.gz). I put the mesh file (NACA0015_4degree_2.5D_0515.xml, some mesh pictures in mesh_pictures.tar.gz) and setting file(session.xml) in my e-mail. Could you please tell me where the trouble is, the mesh or the setting file? I wish all of you are fine and healthy. Thank you for your help. Kind regards, Zhaoyu Wang Shanghai Jiao Tong University <NACA0015_4degree_2.5D_0515.xml><session.xml><DragLift.fce><NACA0015_4degree_2.5D_0515_9.chk.tar.gz><mesh_pictures.tar.gz>_______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users
Hi Zhaoyu, I have checked the vorticity field. The voticity doesn't diffuse beyond the first layer of elements. You can increase the number of modes P to 4 or 5. At first, I suggest you using HomModesZ = 2, which is faster in testing. Cheers Ankang ________________________________ From: Sherwin, Spencer J <s.sherwin@imperial.ac.uk> Sent: 18 May 2020 09:17 To: 王昭予 <clemden@sjtu.edu.cn> Cc: nektar-users <nektar-users@imperial.ac.uk>; Gao, Ankang <ankang.gao@imperial.ac.uk> Subject: Re: [Nektar-users] Quasi-3D simulation of NACA0015 Hi Zhaoyu, I am cc’ing Ankang who has been running Naca 0012 Aerofoils recently. Hopefully he can have a look to see what might be going on. Cheers, Spencer. Spencer Sherwin FREng, FRAeS Head of Aerodynamics Section, Director of Research Computing Service, Professor of Computational Fluid Mechanics, Department of Aeronautics, s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> South Kensington Campus, Phone: +44 (0)20 7594 5052 Imperial College London, Fax: +44 (0)20 7594 1974 London, SW7 2AZ, UK http://www.imperial.ac.uk/people/s.sherwin/ On 18 May 2020, at 06:27, 王昭予 <clemden@sjtu.edu.cn<mailto:clemden@sjtu.edu.cn>> wrote: ******************* 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 all, I have a Quasi-3D simulation of NACA0015 at Rec=40000. My purpose is to verify the aerodynamic forces(lift coefficient, drag coefficient,pressure coefficient). The simulation is run at P=3 and the chord length is 0.12m(AOA=4 degree). In the spectral/hp planes(x-y plane), I generate Quadrilateral elements with ICEM CFD. 20 convective time (T=20C/U) is used to cover the transient phase.Time-averages are subsequently sampled for further 20 convective time. However, something may be wrong with the setting of parameters. The variation of aerodynamic forces in DragLift.fce(attached) become stagnant after few time steps. I also think the flow is not 'started' correctly, I cant see any vortex structures during post-processing, even the convective time is sufficient(attached,NACA0015_4degree_2.5D_0515_9.chk.tar.gz). I put the mesh file (NACA0015_4degree_2.5D_0515.xml, some mesh pictures in mesh_pictures.tar.gz) and setting file(session.xml) in my e-mail. Could you please tell me where the trouble is, the mesh or the setting file? I wish all of you are fine and healthy. Thank you for your help. Kind regards, Zhaoyu Wang Shanghai Jiao Tong University <NACA0015_4degree_2.5D_0515.xml><session.xml><DragLift.fce><NACA0015_4degree_2.5D_0515_9.chk.tar.gz><mesh_pictures.tar.gz>_______________________________________________ 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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Gao, Ankang
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Sherwin, Spencer J
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王昭予