|
[Sponsors] |
The problems about the turbulentDFSEMinlet method for non-reacting jet |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
April 18, 2019, 12:30 |
The problems about the turbulentDFSEMinlet method for non-reacting jet
|
#1 |
New Member
lgz
Join Date: Apr 2019
Posts: 4
Rep Power: 7 |
Hi,
I have run a non-reacting case with the initial turbulent inlet boundary condition which was created by the turbulentDFSEM method. However, the results there are no velocity fluctuation (u') in the streamline. I don't know how to deal with this problem. I would appreciate any help on this matter. Thanks in advance! The cases including the files: 0/ were attached. The turbulentDFSEMinlet was introduced in this website: https://www.openfoam.com/releases/op...conditions.php |
|
January 27, 2020, 04:23 |
|
#2 |
Member
Marc
Join Date: May 2017
Posts: 42
Rep Power: 9 |
Maybe it's a bit late but the line:
Code:
L uniform 0; If you used a precursor RANS simulation there are correlations to obtain L from you data. For example for a simulation you have that: You can find similar correlations for the model you employed. If you didn't get that data from a precursor RANS, I would suggest looking a two-point correlations to obtain . |
|
May 20, 2020, 16:19 |
|
#3 |
New Member
Xiangjie Wang
Join Date: Jul 2019
Posts: 26
Rep Power: 7 |
Hi Marc,
I encountered the same problem. Could you please give me some suggestions on how to do the RANS precursor simulation? I set turbulentDFSEMInlet as my inlet velocity. My computational domain is a wind tunnel with a 50(streamwise)*27.5(width)*22.5(height). I have run my simulation with a uniform velocity inlet and the results showed that it could work. But when I changed my inlet boundary condition of U, it couldn't. After inputing blockMesh and decomposePar, I input: mpirun -np 12 pisoFoam -parallel. But it was stuck at the first time step, which showed: Time = 0.005 Courant Number mean: 0 max: 0 In my simulation, the simulation type is RAS, RAS model is KEpsilon. I only defined the mean velocity profile in ./constant/boundaryData/inlet directory, and for R and L, I set them to a fixed value. This is how my inlet boundary of U looks like: inlet { type turbulentDFSEMInlet; delta 12; nCellPerEddy 1; d 1; R uniform (0.5 0.1 0.1 0.03 0.01 0.01); L uniform 0.005; mapMethod nearestCell; value $internalField; } I will appreciate it if you can give me some suggestions! Thanks! Xiangjie |
|
July 20, 2023, 13:57 |
turbulentDFSEMInlet gets stuck
|
#4 | |
New Member
Alireza Maleki
Join Date: Aug 2017
Location: United State
Posts: 20
Rep Power: 9 |
Quote:
Hi Wang, It is late, but I have the same problem, it just got stuck in the first iteration and even it does not start making the turbulence and solving the velocity equation. my simulation is a LES and I gave the R, L, and U, and I'm using the turbulentDFSEMInlet with the following setup PHP Code:
PHP Code:
|
||
July 20, 2023, 14:35 |
|
#5 | |
New Member
Xiangjie Wang
Join Date: Jul 2019
Posts: 26
Rep Power: 7 |
Hi Alireza,
I guess you have found out how to solve the problem. You are using an old version of Openfoam, am I right? Quote:
|
||
July 20, 2023, 15:22 |
|
#6 |
New Member
Alireza Maleki
Join Date: Aug 2017
Location: United State
Posts: 20
Rep Power: 9 |
||
July 20, 2023, 15:24 |
|
#7 |
New Member
Xiangjie Wang
Join Date: Jul 2019
Posts: 26
Rep Power: 7 |
||
Tags |
turbulent boundary |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Low temp. (~ 300 K) turb. jet & JANAF problems | bart_weisser | OpenFOAM Running, Solving & CFD | 0 | February 11, 2010 18:50 |
Problems with ansys 12 multizone method | jflacerda | ANSYS Meshing & Geometry | 2 | November 19, 2009 11:31 |
Jet penetration problems | Ahmad | CFX | 6 | May 6, 2006 11:51 |
Solution method for transient problems | Roberto Ciardulli | Siemens | 10 | November 28, 2000 04:38 |
Has the pressure correction method problems? | X. Ye | Main CFD Forum | 17 | September 1, 1999 16:14 |