From johan at mech.kth.se Mon Oct 12 01:46:40 2009 From: johan at mech.kth.se (Johan Ohlsson) Date: Mon, 12 Oct 2009 08:46:40 +0200 Subject: [Nek5000-users] accurate restart for new file format Message-ID: <4AD2D0D0.8060807@mech.kth.se> Dear Paul and Stefan, I found a note in prepost.f that the accurate restart might be spoiled because of the multi-file i/o. Could I easily fix it or would it be messy? Best regards, Johan -- Johan Ohlsson Department of Mechanics, KTH SE-100 44, Stockholm, Sweden Phone: +46 8 7906876 E-mail: johan at mech.kth.se From fischer at mcs.anl.gov Mon Oct 12 02:39:33 2009 From: fischer at mcs.anl.gov (Paul Fischer) Date: Mon, 12 Oct 2009 02:39:33 -0500 (CDT) Subject: [Nek5000-users] accurate restart for new file format In-Reply-To: <4AD2D0D0.8060807@mech.kth.se> References: <4AD2D0D0.8060807@mech.kth.se> Message-ID: Hi Johan, I'm not certain of the current status, but it should be reparable. What torder are you using ? 2 or 3 ? Do you have 3 or 4 successive fields in a row ? It's been a long time since I've used this feature in nek, so it will take me a bit of time to get up to speed with it. Paul On Mon, 12 Oct 2009, Johan Ohlsson wrote: > Dear Paul and Stefan, > > I found a note in prepost.f that the accurate restart might be spoiled > because of the multi-file i/o. Could I easily fix it or would it be messy? > > Best regards, > Johan > > -- > Johan Ohlsson > Department of Mechanics, KTH > SE-100 44, Stockholm, Sweden > Phone: +46 8 7906876 > E-mail: johan at mech.kth.se > > _______________________________________________ > Nek5000-users mailing list > Nek5000-users at lists.mcs.anl.gov > https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users > From wangzhicheng at mail.etp.ac.cn Tue Oct 13 06:54:49 2009 From: wangzhicheng at mail.etp.ac.cn (=?gb2312?B?d2FuZ3poaWNoZW5n?=) Date: Tue, 13 Oct 2009 19:54:49 +0800 (CST) Subject: [Nek5000-users] =?gb2312?b?VC1tZXNoICYgVi1tZXNoID8=?= Message-ID: <4AD46A89.000091.29810@app5> Hi Stefan Could you please explain what "T-mesh" and "V-mesh" stand for? Best Wishes Zhicheng -------------- next part -------------- An HTML attachment was scrubbed... URL: From stefanke at lav.mavt.ethz.ch Tue Oct 13 08:07:28 2009 From: stefanke at lav.mavt.ethz.ch (stefanke) Date: Tue, 13 Oct 2009 15:07:28 +0200 Subject: [Nek5000-users] T-mesh & V-mesh ? In-Reply-To: <4AD46A89.000091.29810@app5> References: <4AD46A89.000091.29810@app5> Message-ID: <9A19BC22-C06C-4815-8D5A-EC7249A2C2FF@lav.mavt.ethz.ch> Hi, nek5000 comes with two different meshes to account for conjugate heat transfer: V-mesh: velocity mesh with nelgv elements T-mesh: temperature mesh with nelgt elements Please note that the V-mesh is always a subset of the T-mesh (all element of V are in T as well). The 'solid' could be defined as T\V (all T elements w/o V). hth, Stefan On Oct 13, 2009, at 1:54 PM, wangzhicheng wrote: > Hi Stefan > > Could you please explain what "T-mesh" and "V-mesh" stand for? > > Best Wishes > > Zhicheng > > > > > _______________________________________________ > Nek5000-users mailing list > Nek5000-users at lists.mcs.anl.gov > https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users From wangzhicheng at mail.etp.ac.cn Fri Oct 16 11:46:16 2009 From: wangzhicheng at mail.etp.ac.cn (=?gb2312?B?zfXWvrPJ?=) Date: Sat, 17 Oct 2009 00:46:16 +0800 Subject: [Nek5000-users] Reference for LES filter Message-ID: <200910170046160151194@mail.etp.ac.cn> Hi Stefan, I'm puzzled with the subroutine build_1d_filt in postpro.f. Could you please give some papers on this problem? Regards, Zhicheng 2009-10-17 ??? -------------- next part -------------- An HTML attachment was scrubbed... URL: From stefanke at lav.mavt.ethz.ch Fri Oct 16 12:23:10 2009 From: stefanke at lav.mavt.ethz.ch (stefanke) Date: Fri, 16 Oct 2009 19:23:10 +0200 Subject: [Nek5000-users] Reference for LES filter In-Reply-To: <200910170046160151194@mail.etp.ac.cn> References: <200910170046160151194@mail.etp.ac.cn> Message-ID: <8A20EB6D-9EC1-4B90-A279-3BE0CE193EA4@lav.mavt.ethz.ch> Paul: you may want to supplement my answer. To give you an idea of what we're doing here: 1. construct a low-pass filter transfer function (to preserve the accuracy the transfer function needs to be smooth). The particular shape of the transfer function depends in the application. 2. transform the Lagrange polynomials into a hierarchical modal basis (e.g. Legendre polynomials) 3. apply the filer 4. apply transpose of transformation (see step 2) At the moment we support only two options for LES: - dynamic Smagorinsky (only tensor product domains are supported for now) - simple filter model In this model we simply filter the velocities u after every timestep (e.g. only last 2 modes are filtered using a quadratic transfer function. The last mode is filtered by 5%). The filtering operation does not preserve div(u) however this effect is typically very little. I cannot tell you how much and many modes you need to filter because this model lacks of a physical justification. However it is in the spirit of every LES model. All of them try to remove energy which you cannot present by your grid. hth, Stefan On Oct 16, 2009, at 6:46 PM, ??? wrote: > Hi Stefan, > > I'm puzzled with the subroutine build_1d_filt in postpro.f. Could > you please give some papers on this problem? > > Regards, > > Zhicheng > > 2009-10-17 > ??? > _______________________________________________ > Nek5000-users mailing list > Nek5000-users at lists.mcs.anl.gov > https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users -------------- next part -------------- An HTML attachment was scrubbed... URL: