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Showing results 1 to 20 of 20 Search took 0.00 seconds. Search: Posts Made By: schwermetall

Forum: OpenFOAM November 9, 2011, 06:07

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi all, sorry for not responding for while. ... Hi all, sorry for not responding for while. @Technoyoungman: Yes I did check the total pressure, but as I didn't made a picture back then, I can't tell you anything at the moment. I have to...

Forum: OpenFOAM October 27, 2011, 10:57

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall I would support that. The Schemes only influenced... I would support that. The Schemes only influenced the fluctuations. When it comes to cell size of the mesh, I'm trying a very coarse mesh in inviscid mode at the moment and the shock is off 10%....

Forum: OpenFOAM October 27, 2011, 10:31

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Thats what I heared too. I'm now trying to... Thats what I heared too. I'm now trying to run rhoCentralFoam in inviscid mode. The fluctuations are not too big in my case, but the main problem I have is that, the shock on my airfoil is too far...

Forum: OpenFOAM October 25, 2011, 08:57

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi ndr, no I didn't resolve the Boundary layer... Hi ndr, no I didn't resolve the Boundary layer with y+ = 1.The reason is, that it would take ages. I now got the possibility to run my cases on 6 processors and simulating one second of flow takes...

Forum: OpenFOAM October 14, 2011, 10:41

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Yes it's about a pressure velocity decoupling. ... Yes it's about a pressure velocity decoupling. :D thanks a lot for all your help until now. I'll let you if I find anything out, but maybe I can unmystify it a little bit ;-) Have nice weekend....

Forum: OpenFOAM October 14, 2011, 10:11

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall So after waiting for ages I reached a time of... So after waiting for ages I reached a time of 0.186 and you're the oscillations are slowly decaying, as you can see below. So I'm going to wait a little longer. I got some input from my supervisor...

Forum: OpenFOAM October 13, 2011, 12:43

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi vkrastev my actual case is running with ... Hi vkrastev my actual case is running with spalart-Almaras. As you can see below, the Amplitude of the fluctuations diminished a little bit. The position of the shock probably becomes better...

Forum: OpenFOAM October 13, 2011, 12:01

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi vkrastev just changed to Tadmor, but it does... Hi vkrastev just changed to Tadmor, but it does not seem to change the fluctuations. As the fluctuations are spacial, I'm thinking the problem might be connected to fvSolution. Maybe I gonna try ...

Forum: OpenFOAM October 13, 2011, 10:19

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi Foamers, as I'm running the Spalart-Almaras... Hi Foamers, as I'm running the Spalart-Almaras model I get the following warning: --> FOAM Warning : From function tmp<volScalarField> SpalartAllmaras::k() const in file...

Forum: OpenFOAM October 13, 2011, 07:58

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hey Foamers, I did as alberto suggested: ... Hey Foamers, I did as alberto suggested: gradSchemes { default cellLimited leastSquares 1; { The result got much better after that as you can see below. But the...

Forum: OpenFOAM October 12, 2011, 13:13

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi vkrastev concerning div(tauMC) I now... Hi vkrastev concerning div(tauMC) I now think, that I remember that Openfoam returned an error when I tried the upwind scheme. But your explanation is pretty convinient. short Update: For the...

Forum: OpenFOAM October 12, 2011, 11:22

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi vkrastev, first of all many thanks for... Hi vkrastev, first of all many thanks for staying with me and my problem. Yes I tried upwind, but not for div(tauMC). I'm now trying MUSCL 0.9 for div(phi,omega) and div(phi,k). As it takes...

Forum: OpenFOAM October 12, 2011, 10:44

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi guys I now changed the boundary conditions... Hi guys I now changed the boundary conditions for velocity at the outlet to type inletOutlet inletValue (0 0 0) and pressure at the outlet to waveTransmissive with lInf 2 Doesn't seem...

Forum: OpenFOAM October 12, 2011, 09:43

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall I already tried sonicFoam (2.0) using different... I already tried sonicFoam (2.0) using different boundary conditions schemes etc etc .... But I wasn't able to get a shock visible, with that solver. I'm using adjustTimeStep yes; with maxCo of...

Forum: OpenFOAM October 12, 2011, 06:40

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi thanks for the advice. I thought about... Hi thanks for the advice. I thought about changing the boundary condition, but the thing that kept from doing it was, that I couldn't find any pressure waves being reflected at the boundaries....

Forum: OpenFOAM October 12, 2011, 04:56

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall hi vkrastev... hi vkrastev (http://www.cfd-online.com/Forums/members/vkrastev.html) I'm using RAS model with kOmega turbulence model plus wallfunction, not with resolved boundary layer. My y+ ranges between 26...

Forum: OpenFOAM October 12, 2011, 04:08

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall It seems I found the problem concerning the... It seems I found the problem concerning the unsteady behavior. I changed the mesh at the trailing edge, so that cells around the last point of the airfoil get less skewed. Below you can see...

Forum: OpenFOAM October 11, 2011, 08:20

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Hi Foamers, first of all thanks for the... Hi Foamers, first of all thanks for the support. Unfortunately I don't get a steady state solution. At first a I got two shocks on the upper and lower side in the region where they belong. But...

Forum: OpenFOAM October 10, 2011, 08:13

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall Thanks a lot for the hint rhoCentralFoam really... Thanks a lot for the hint rhoCentralFoam really works much better than the others for my case. Even if I don't understand why, as I also tried - rhoPimpleFoam (which should be density based right ?)...

Forum: OpenFOAM October 7, 2011, 11:48

Replies: 53 No shock in airfoil 0012 case despite of Mach number exceeds 1 Views: 14,409 Posted By schwermetall No shock in airfoil 0012 case despite of Mach number exceeds 1 Hi Foamers, I'm pretty new to OpenFoam and CFD in general. I managed to get good results for low subsonic speeds on the NACA 0012. Now I'm trying to go transsonic for my thesis. I'm struggling to...

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