Search found 36 matches

by Sidemountyucatan
Thu Jun 04, 2020 6:44 am
Forum: CfdOF / CFD
Topic: Initialise flow field
Replies: 0
Views: 187

Initialise flow field

Hi,

I have a question to the selection for the flow initialisation in CfdOf. When is it recommended to use potential flow and when use values from far field ?

Thx
by Sidemountyucatan
Mon May 18, 2020 7:34 am
Forum: CfdOF / CFD
Topic: Install CFDOF on Ubuntu
Replies: 1
Views: 237

Install CFDOF on Ubuntu

OS: Linux Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.18.16093 (Git) Build type: Unknown Branch: master Hash: 690774c0effe4fd7b8d2b5e2fb2b8c8d145e21ce Python version: 2.7.12 Qt version: 4.8.7 Coin version: 4.0.0a OCC version: 7.0.0 Locale: English/UnitedStates (en_US) Hi, I have ...
by Sidemountyucatan
Thu May 14, 2020 8:27 am
Forum: CfdOF / CFD
Topic: Deviation in Residuals for turbulence energy and dissipation
Replies: 1
Views: 171

Deviation in Residuals for turbulence energy and dissipation

Hi all, does anybody can advice me the meaning of deviation in the residuals of turbulence energy and dissipation ? We talk about dimensions of 10^4. What does it theoretically mean (dissipation converge faster and better than turbulence energy) and what would be the strategy to improve this ? Thx. ...
by Sidemountyucatan
Wed May 06, 2020 1:58 pm
Forum: CfdOF / CFD
Topic: Termination condition
Replies: 1
Views: 164

Termination condition

Hi,

can anybody tell me what the criterias are for the solver(s) to terminate a simulation, sucessfully or unsucessfully ?
by Sidemountyucatan
Thu Apr 30, 2020 2:15 pm
Forum: CfdOF / CFD
Topic: Simulation failed
Replies: 2
Views: 230

Simulation failed

OS: Windows 10 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.18.4 (GitTag) Build type: Release Branch: releases/FreeCAD-0-18 Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8 Python version: 3.6.6 Qt version: 5.6.2 Coin version: 4.0.0a OCC version: 7.3.0 Locale: German/Switzerland (de...
by Sidemountyucatan
Fri Feb 14, 2020 12:31 pm
Forum: CfdOF / CFD
Topic: File save
Replies: 1
Views: 151

File save

OS: Windows 10 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.18.4 (GitTag) Build type: Release Branch: releases/FreeCAD-0-18 Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8 Python version: 3.6.6 Qt version: 5.6.2 Coin version: 4.0.0a OCC version: 7.3.0 Locale: German/Switzerland (de...
by Sidemountyucatan
Tue Feb 11, 2020 6:25 pm
Forum: CfdOF / CFD
Topic: Simulation does exit with error
Replies: 8
Views: 391

Re: Simulation does exit with error

Constructive discussion ! I appriciate that a lot ! Basically I want see the stream in / around the two structures (red circles in picture). (...has to do with stream in clean room service, particle separation etc.) Regarding the velocity: I have to check but it should be 0.2 m/s =approx. 0.8 km/h. ...
by Sidemountyucatan
Tue Feb 11, 2020 2:06 pm
Forum: CfdOF / CFD
Topic: Simulation does exit with error
Replies: 8
Views: 391

Re: Simulation does exit with error

Thx a lot for your feedback.

in my solution all residuals are going towards 10^-4. Except the one for the pressure. Do you have any idea
why ?
by Sidemountyucatan
Tue Feb 11, 2020 9:06 am
Forum: CfdOF / CFD
Topic: Simulation does exit with error
Replies: 8
Views: 391

Re: Simulation does exit with error

Hi thschrader,

you are right ! With this approach it works. But what is the reason ? Simply because it is no potential flow ?
(not friction free, not rotation free) ? Or is it a code issue ?

Do you have any clue ?

Thx
by Sidemountyucatan
Sun Feb 09, 2020 3:23 pm
Forum: CfdOF / CFD
Topic: Simulation does exit with error
Replies: 8
Views: 391

Simulation does exit with error

Hi all, OS: Windows 10 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.18.4 (GitTag) Build type: Release Branch: releases/FreeCAD-0-18 Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8 Python version: 3.6.6 Qt version: 5.6.2 Coin version: 4.0.0a OCC version: 7.3.0 Locale: German/Switzer...