Search Results

User Name Remember Me Password

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

Forum: Main CFD Forum November 25, 2016, 14:13

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro To tell my opinion, I would consider ... To tell my opinion, I would consider fvm::laplacian(nuEff, U) a wrong approach. The second one appers correct as it retains the SGS viscosity under the divergence operator. Remember that in the...

Forum: Main CFD Forum May 30, 2016, 17:00

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro good, just remember that the width of the test... good, just remember that the width of the test filter must be greater than that of the primary

Forum: Main CFD Forum May 30, 2016, 16:41

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro Consider the filtered momentum equation without... Consider the filtered momentum equation without any model, where you have the exact unresolved term. Now, apply any other filter further to this filtered equation and you get the Germano identity...

Forum: Main CFD Forum May 30, 2016, 16:23

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro The Germano identity is exact, just it follows as... The Germano identity is exact, just it follows as a consequence of a filter hierarchy... Then you decide the type of approximation by introducing the SGS model, it can be an eddy viscosity, a scale...

Forum: Main CFD Forum January 26, 2016, 11:40

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro there are several papers of Pruett on temporal... there are several papers of Pruett on temporal filtering, but you can find also different authors working on that... In addition, I suggest the state-of-the art books about LES (Sagaut, Layton et...

Forum: Main CFD Forum January 26, 2016, 11:22

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro be careful, the time filtering does not exclude... be careful, the time filtering does not exclude the co-existance of a spatial filtering in LES

Forum: Main CFD Forum January 26, 2016, 09:23

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro The answer is no ... consider the 1D case and the... The answer is no ... consider the 1D case and the continuous integral between [-h,+h]. If you see the trasfer function, it has an infinite number of zeros along the wavenumber axis. That does not...

Forum: Main CFD Forum January 26, 2016, 03:32

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro of course, it is not possible to eliminate the... of course, it is not possible to eliminate the truncation error, but if it were disregardeble then the filter width would be defined by the extension of the integrals in continuous form... The...

Forum: Main CFD Forum January 25, 2016, 18:39

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro The Eq.(59) introduces m just as a multiplying... The Eq.(59) introduces m just as a multiplying factor for the size of the computational grid. But that does not define rigorously the filter width as 2 and 4 the mesh size. According to the transfer...

Forum: Main CFD Forum January 22, 2016, 03:35

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro While using the top-hat as test filtering the... While using the top-hat as test filtering the filter width is not strictly the size of the volume. This aspect is illustrated in the LES literature and you can find some details in my JCP paper you...

Forum: Main CFD Forum January 21, 2016, 17:46

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro Sorry, I am not sure about your question ..If you... Sorry, I am not sure about your question ..If you would define the filter width equal to 3*delta then just define the integral over [x-3/2*delta, x+3/2*delta] and use a proper discretization...

Forum: Main CFD Forum January 21, 2016, 16:19

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro have also a look at section 5.1 here: ... have also a look at section 5.1 here: ...

Forum: Main CFD Forum January 21, 2016, 16:15

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro the formula is generally valid for uniform... the formula is generally valid for uniform meshes, you can find the same formula at page 75 of the book of Ferziger & Peric

Forum: Main CFD Forum January 21, 2016, 12:06

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro good, if you have further questions do not... good, if you have further questions do not hesitate to contact me

Forum: Main CFD Forum January 21, 2016, 03:43

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro Hello Julio, be careful, the test-filtering is... Hello Julio, be careful, the test-filtering is applied on the main filtered velocity field, not on the stress tensor (derivative could not commute with filtering)... the test filtering can be...

Forum: Main CFD Forum October 14, 2013, 13:26

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro I have to distinguish between the test filtering... I have to distinguish between the test filtering procedure and its numerical implementation ... If you want to use a top-hat filter, in a 2d plane say (x,y), you have to chose its width. Therefore,...

Forum: Main CFD Forum October 14, 2013, 09:09

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro you have also a piston moving in it? I think... you have also a piston moving in it? I think you have to build, for each computational node, a local volume surrounding it in such a way that a 3D volume average can be computed. If you are using a...

Forum: Main CFD Forum October 14, 2013, 07:19

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro 1) the type of test filtering depends also on the... 1) the type of test filtering depends also on the flow problem, if your problem is a plane channel flow,e.g. homogeneous in the x and z directions (stream-wise and spanwise), you can do a 2d filter,...

Forum: Main CFD Forum October 14, 2013, 03:41

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro 1) do you want a 2d or a 3d test filtering? 2)... 1) do you want a 2d or a 3d test filtering? 2) what about your test-to-grid filter ratio, you wanto to fix the value =2?

Forum: Main CFD Forum October 13, 2013, 18:07

Replies: 39 Dynamic SGS model procedure in Large eddy simulation Views: 3,942 Posted By FMDenaro In principle, the type of test filtering for the... In principle, the type of test filtering for the dynamic procedure has not to be equal to the main one. That means you can use a 2D test filtering, this happens commonly for plane channel flow. ...

Showing results 1 to 20 of 20

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