Search Results

User Name Remember Me Password

Showing results 1 to 14 of 14 Search took 0.00 seconds. Search: Posts Made By: cfdnewbie

Forum: Main CFD Forum December 26, 2011, 07:12

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie I do not mean to nitpick here, but it does not... I do not mean to nitpick here, but it does not necessarily have to be piecewise, think of global methods. Also, curve fit sounds like "interpolation" to me, which is also not the only way to do it,...

Forum: Main CFD Forum December 26, 2011, 07:08

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie We are talking about the order of the scheme, not... We are talking about the order of the scheme, not of the solution here, that's two very different things. I will walk you through how the process is done in code verification, see e.g. the report by...

Forum: Main CFD Forum December 25, 2011, 07:12

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie Hi duri, thanks for your great reply! ... Hi duri, thanks for your great reply! I tend to agree for simple flows, where the inlet and outlet are far away from the zone of action, so to speak. But let's take for example a shock -...

Forum: Main CFD Forum December 24, 2011, 20:25

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie You just wont let it go, will you? The keyword... You just wont let it go, will you? The keyword here is overall, not local. As I have written above, integral. But I can tell that your background is more on the practical than on the theoretical...

Forum: Main CFD Forum December 24, 2011, 20:06

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie No, I don't believe that, but it seems you... No, I don't believe that, but it seems you insist. I rest my case here, since the concept of an integral norm does not seem to resonate with you, friend. Good luck in your further CFD career, all...

Forum: Main CFD Forum December 24, 2011, 18:37

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie Too bad, I am sure we could have all benefitted... Too bad, I am sure we could have all benefitted from this, but the discussion speaks for itself, then. Just please do me one favor and answer my question in red: were you talkung about the...

Forum: Main CFD Forum December 24, 2011, 18:04

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie Well, you might have pointed that out, but I... Well, you might have pointed that out, but I differ in my opinion. Maybe you didn't read my post carefully, friend. I AM agreeing with you that one cell will not affect each other cell in your...

Forum: Main CFD Forum December 24, 2011, 14:56

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie . I beg to differ. A first order cylinder BC... . I beg to differ. A first order cylinder BC will produce spurious entropy at each kink, thereby generating a entropy wake behind the object, and destroy e.g. symmetry. NS on the other hand...

Forum: Main CFD Forum December 24, 2011, 14:38

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie The Taylor series expansion is only valid for... The Taylor series expansion is only valid for h->0, that's in the definition of Taylor's expansion, is it not?

Forum: Main CFD Forum December 24, 2011, 06:58

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie Hey Arjun, let's debate this :) The... Hey Arjun, let's debate this :) The concept of an "order of a scheme" comes from the Taylor series expansion and is ONLY valid for h -> 0, i.e. in the limit of grid spacing going to zero. So...

Forum: Main CFD Forum December 21, 2011, 03:58

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie Allright, so what you are basically doing is an... Allright, so what you are basically doing is an extrapolation form the inside, sth like a supersonic outflow, correct? in that case, I'm wondering if the discussion about the order of the outflow...

Forum: Main CFD Forum December 15, 2011, 14:08

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie I am a little bit confused about your notation... I am a little bit confused about your notation here: If your flow goes from left to right (so it leaves the domain at the right face), and b=0 would be the outflow face, then b=-1 and b=-2 would be...

Forum: Main CFD Forum December 15, 2011, 14:01

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie The effect at the BC will perpetuate itself into... The effect at the BC will perpetuate itself into the domain, so while not all cells will become first order accurate, the "bad cells" will drag your overall convergence down. This may or may not be a...

Forum: Main CFD Forum December 12, 2011, 13:32

Replies: 30 2nd order boundary conditions for 2nd order discretization? Views: 5,619 Posted By cfdnewbie Yes, I agree with Rami. The overall solution will... Yes, I agree with Rami. The overall solution will fall back to the lowest order in your domain, i.e. the boundary contribution. The becomes even more pronounced for high order schemes (>>2), where a...

Showing results 1 to 14 of 14

Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home General Forums     Main CFD Forum     System Analysis     Structural Mechanics     Electromagnetics     CFD Freelancers     Hardware     Lounge Software User Forums     ANSYS         CFX         FLUENT             Fluent Multiphase             Fluent UDF and Scheme Programming         ANSYS Meshing & Geometry     Autodesk Simulation CFD     AVL FIRE     COMSOL     CONVERGE     Fidelity CFD     FloEFD, FloWorks & FloTHERM     FLOW-3D     OpenFOAM         OpenFOAM News & Announcements             OpenFOAM Announcements from ESI-OpenCFD             OpenFOAM Announcements from OpenFOAM Foundation             OpenFOAM Announcements from Other Sources         OpenFOAM Installation         OpenFOAM Meshing & Mesh Conversion         OpenFOAM Pre-Processing         OpenFOAM Running, Solving & CFD         OpenFOAM Post-Processing         OpenFOAM Programming & Development         OpenFOAM Verification & Validation         OpenFOAM Community Contributions             OpenFOAM CC Toolkits for Fluid-Structure Interaction         OpenFOAM Journal         OpenFOAM Bugs     Phoenics     REEF3D         REEF3D News & Announcements     Siemens         STAR-CCM+         STAR-CD     SU2         SU2 News & Announcements         SU2 Installation         SU2 Shape Design Mesh Generation & Pre-Processing Software     ANSA     enGrid     GridPro     Pointwise & Gridgen Visualization & Post-Processing Software     EnSight     FieldView     ParaView     Tecplot Special Topics     Mesh Generation & Pre-Processing     Visualization & Post-Processing CFD Online Community     Site News & Announcements     Site Help, Feedback & Discussions     CFD-Wiki