CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Ansys and Openfoam Simulation

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By checasino

LinkBack Thread Tools Search this Thread Display Modes
Old   November 13, 2023, 04:54
Post Ansys and Openfoam Simulation
New Member
Silvia Sambuca
Join Date: Apr 2023
Posts: 7
Rep Power: 3
checasino is on a distinguished road
Hy everybody,
I am simulating a turbulent airflow flowing in a bypass tube of circular diameter of 0.07 m from a condition of 300 Pa in the inlet and ambient pressure in the outlet (so only pressures are known). I created the mesh (I am attaching an image in here) in ANSYS mantaining a y+ of around 30 (calculated on the target velocity that I would like to reach).

The mesh obtained is quite regular. Then I exported the mesh so that I could use both Ansys (Fluent) calculation and Openfoam. I will attach also the boundary conditions for both solvers.
Finally I tried to mantain same/similar schemes for both solvers: steady solvers and second order schemes for both, same convergence criteria (1e-6) and relaxation parameters (p/k/epsilon 0.4 and U 0.5).
First of all the simulation on Ansys is converging, instead Openfoam not (even though residuals are around 1e-5 at very high iteration number). Even though the values of pressure are comparable (remembering that values of P are in m2/s2 in Openfoam), the values of velocity and so flowrate are very different (0.0450 m3/s in Openfoam and 0.0539 in Ansys). Can somebody explain why these values are so different ?

Notice that the values of 122 m2/s2 in Openfoam was defined after a first simulation in Ansys, that gave 122 m2/s2 as the value of the static pressure.
aerosayan likes this.
checasino is offline   Reply With Quote


ansys, openfoam, tube flow

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[Other] Ansys Fluent to OpenFOAM silver.blaze OpenFOAM Meshing & Mesh Conversion 2 July 27, 2022 08:32
[Commercial meshers] Moving mesh from Ansys to OpenFOAM MFWilliams OpenFOAM Meshing & Mesh Conversion 0 December 13, 2021 05:43
ANSYS fluent and OpenFoAM comparison gentodin Main CFD Forum 6 February 26, 2021 03:58
New OpenFOAM Forum Structure jola OpenFOAM 2 October 19, 2011 06:55
OpenFOAm solver, ANSYS post processing achinta OpenFOAM 3 May 13, 2010 02:54

All times are GMT -4. The time now is 09:29.