Begin forwarded message: From: "中华腾飞" <592835068@qq.com<mailto:592835068@qq.com>> Subject: [Nektar-users] compressible solver issues Date: 17 December 2018 at 07:37:07 GMT To: "nektar-users" <nektar-users@imperial.ac.uk<mailto:nektar-users@imperial.ac.uk>> Hi all! I want to ask about the boundray conditions.In 3D task,the variables are only rho,rhou,rhov,rhow and E? We can't set other variables,such as p(pressure),t(temperature)? In D type boundary condtions,if i give values to variables,such as ' VAR="rho" VALUE="rhoInf" after i have defined rhoInf=1.007, it means rho=1.007? In some tutorials, they set VALUE="0",rho=0 or E=0,it seems to be impossible! _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Begin forwarded message: From: "中华腾飞" <592835068@qq.com<mailto:592835068@qq.com>> Subject: [Nektar-users] PressureOutflow boundary condtions Date: 19 December 2018 at 03:23:25 GMT To: "nektar-users" <nektar-users@imperial.ac.uk<mailto:nektar-users@imperial.ac.uk>> Hi all! I want to give static pressure on my outlet, p0eInf is the value that i have defined in parameters . Can you help me check out my example? By the way, i don't know how to set 'WallAdiabatic' boundary conditions ,can you help me check out my example? [cid:072d7b32-4a9d-4ad6-93d0-00c55fb719df@eurprd06.prod.outlook.com] [cid:ec3807d0-b91e-4cdd-a7d8-73c9ad130375@eurprd06.prod.outlook.com] Sometimes when i run the calculation,it will report an error called 'vacuum is generated by given data'.If i change the TimeStep , it will calculate some steps.How to explain it? Looking forward to your replay! _______________________________________________ Hi, We seem to have had quite a few emails last week from you. Can I first ask you to provide a name to write to since non of your emails are signed. Can I presume you have looked over the user-guide? i have not run the compressible flow solver so much so am unable to help you directly. However two of my PhD students are now working on the compressible code and so I am cc’ing them on this email since they might be able to help out. However obviously they have their own projects to work on too so please keep the emails about the most important points. Best regards Spencer. Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Begin forwarded message: From: "中华腾飞" <592835068@qq.com<mailto:592835068@qq.com>> Subject: [Nektar-users] check out my boundary conditions Date: 21 December 2018 at 07:42:24 GMT To: "nektar-users" <nektar-users@imperial.ac.uk<mailto:nektar-users@imperial.ac.uk>> Hi all! I want to define two groups of values of rho, rhou, rhov, rhow,E on the two different inlets. You can see my example in following pictures. [cid:66f4d31f-59da-4f12-807f-e5ef891a5e06@eurprd06.prod.outlook.com] [cid:d460f3ae-2bb3-4ba5-9737-b101dd7b64a5@eurprd06.prod.outlook.com] The two boundary conditions : [cid:9ea82bbc-7c2a-4bfc-8010-7e7e6df9abb9@eurprd06.prod.outlook.com] [cid:2a749908-0bd3-4954-b9e1-033abac01326@eurprd06.prod.outlook.com] What i want to do is to keep the values of rho ,rhou ,rhov, rhow and E constant on the two boundary,but when i see the calculated results with paraview, the values on the "2" region are changing,only "0" region is constant....I don't know how to solve it.... Looking forward to your reply! _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Begin forwarded message: From: "中华腾飞" <592835068@qq.com<mailto:592835068@qq.com>> Subject: [Nektar-users] PressureOutflow boundary conditions Date: 21 December 2018 at 02:05:53 GMT To: "nektar-users" <nektar-users@imperial.ac.uk<mailto:nektar-users@imperial.ac.uk>> Hi all! The nektar++ developers tell me that nektar++ can't define different static pressures on multiple outlets at the moment and 'VALUE' is not being used . If i just define the same static presssure on multiple outlets , how to set it? It seems that we can only set the value of rho,rhou,rhov,rhow and E,where is pressure? Looking forward to your reply! _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Begin forwarded message: From: "中华腾飞" <592835068@qq.com<mailto:592835068@qq.com>> Subject: [Nektar-users] nektar++ mesh Date: 18 December 2018 at 03:38:49 GMT To: "nektar-users" <nektar-users@imperial.ac.uk<mailto:nektar-users@imperial.ac.uk>> Hi all! When i calculate my task , there is always an error called 'vacuum is generated by given data' .I have tried to check out my boundary conditions and initial conditions ,but it doesn't work. I want to check out my meshes .My meshes are generated by gmsh 3.0.6, all the elements are 'A' (tetrahedron) and about 36912. Can you give me some suggestions about my meshes or geometry?Looking forward to your reply! _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Begin forwarded message: From: "中华腾飞" <592835068@qq.com<mailto:592835068@qq.com>> Subject: [Nektar-users] boundary conditions Date: 21 December 2018 at 02:28:36 GMT To: "nektar-users" <nektar-users@imperial.ac.uk<mailto:nektar-users@imperial.ac.uk>> Hi all! I want to know whether i can define different rho, rhou, rhov, rhow, E on multiple boundaries or not? Looking forward to your reply! _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Begin forwarded message: From: "中华腾飞" <592835068@qq.com<mailto:592835068@qq.com>> Subject: [Nektar-users] Farfield boundary condition Date: 21 December 2018 at 08:38:17 GMT To: "nektar-users" <nektar-users@imperial.ac.uk<mailto:nektar-users@imperial.ac.uk>> Hi all! I want to give total temperature,total pressure and mach number on the inlet using compressible flow solver. Which kind of boundary condition should i use ? The Farfield boundary condtion? Should i calculate the static parameters? The VALUE is constant in the whole process? Can i define two inlets with different parameters using Farfield boundary condition? _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Spencer Sherwin FREng, FRAeS Head, Aerodynamics, 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/