Dear all,
Does anyone know what the boundary conditions for velocity(U) and pressure(p) used in Joachims example ( Lund Recycled Method for LES (flat plate)) are? |
Yes, the boundary condition for the velocity is:
Code:
/*--------------------------------*- C++ -*----------------------------------*\ Code:
/*--------------------------------*- C++ -*----------------------------------*\ Christoph |
Dear Christoph,
Thank you so much for your quick reply!!! I have really been struggling to get the boundary conditions right for this problem. I will try them right away! |
Dear Christoph,
Thank you for uploading the BC files. I tried them with my case and was able to get the problem working after some modifications. The major problem other than the BC's was the accuracy in my solves at each time step. The lack of accuracy was creating artificial turbulence and corrupting my solution. Sincerely, -Tsuyoshi Koyama |
Hi Foamers,
I'm really curious about this method, but unfortunately there is nothing in the dropbox link...Can anyone send me a copy of the test case to the address zfr2078@gmail.com ? Thanks in advance!!:) Regards J Zhang |
Dear all,
You might be interested in looking at a python package I have written, it allows to rescale sampled velocity fields using the Lund's rescaling procedure and save them in a format readable by OpenFOAM. There is a User guide available here: http://eddylicious.readthedocs.io/ And the code is here https://github.com/timofeymukha/eddylicious |
2 Attachment(s)
Hi Joachim,
I am very interested in Lund's recycling methods but unfortunately it is used for incompressible flows. So I studied recaling-recycling method and extend it for compressible flows just by adding Van Driest velocity to scaledMappedVelocity and creating scaledMappedTemperature. But I have encountered a problem: I run these boundary conditions well using single processor but failed in parallel calculating. By the way, have you ever calculated in parallel using your code? I just modified your code by adding some extra codes and I think it doesn't affect parallel process. Here's my attached codes for compressible flows. P.S. my OpenFOAM version is 2.4.0 |
Quote:
I wonder where perturbU utility is, there's no such utility in offical version of OpenFOAM, and I don't know how to calculate the initial field for following LES calculation. Any suggestions? Best, Eric |
That utility has been taken out of the standard version (not sure why?) but there's a link in the wiki explaining how to add it back:
https://openfoamwiki.net/index.php/Contrib/perturbU it's very simple and straightforward. |
Hi Mahdi,
Thanks for your quick response, I have download perturbU and successfully compiled it on OpenFOAM-2.4.0. I opened the perturbU.C and after scanning the code I know that Code:
if (setBulk) Code:
if (perturb) Code:
if (perturb) Is there any perturbation theory or related references? Best |
Random perturbations will be easily damped out if they lack a spatial correlation. Also to initialize don't use turbulent profile, use laminar.
Those streaks are based on a paper by Schoppa and Hussain: https://www.researchgate.net/publica...all_turbulence They are the best way to excite the near wall fluctuations and transient into turbulent. |
Quote:
I tried your BCs. Add "mpp.distribute(URecycled);" in scaledMappedTemperatureFixedValueFvPatchField.C, and it will work fine in parallel calculating. Of course, you may have already solved this problem. By the way, which paper are your BCs based on?And how do you set your boundary condition for field p? Best Yifan |
Hi,
I need this BC for my DNS simulation, can anyone share the code and additional files to me? My email is 32420171152101@stu.xmu.edu.cn Thank you very much. |
Could you send me a copy of your case files? It would be great help to setup a base case for comparison of synthetic inflow generation method. My email is y.wang@ttu.edu. Thanks a lot.
|
Joachim's Code
Hi all,
Can anyone please send me the Joachim's code? I did bit of search but couldn't find it anywhere online. Email: oguzhanmurat06@gmail.com Thanks. |
Dear all
I'm really curious about this method, but unfortunately there is nothing in the dropbox link...Can anyone send me a copy of the test case to the address shawnhu94@gmail.com ? Thanks in advance!:D |
Quote:
I'm really curious about this method, but unfortunately there is nothing in the dropbox link...Can anyone send me a copy of the test case to the address shawnhu94@gmail.com ? Thanks in advance! |
Run runLundRescaling --config=rescalingConfigBot
Hi Foamers
Can somebody please tell me how to proceed with this runLundRescaling --config=rescalingConfigBot as mentioned in https://github.com/timofeymukha/eddy..._lund.rst#id15 I am unable to run this command. |
Hi. So, did you install eddylicious? The command is part of the package.
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Hi,
I'm really interested in the Lund's method,but the test case in the dropbox doesn't exist. Can anyone share the files to me? My email is jayddkt@sjtu.edu.cn Thanks a lot. |
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