This slide is describing how to set up the OpenFOAM simulations including rotating geometries.
The SRF (Single Rotating Frame) is covered and MRF (Multiple Reference Frame).will be covered in it.
This slide is about multiphaseEulerFoam which is a CFD solver of OpenFOAM and can analyze multiphase flows. The theory and differences with multiphaseInterFoam are explained.
This slide is describing how to set up the OpenFOAM simulations including rotating geometries.
The SRF (Single Rotating Frame) is covered and MRF (Multiple Reference Frame).will be covered in it.
This slide is about multiphaseEulerFoam which is a CFD solver of OpenFOAM and can analyze multiphase flows. The theory and differences with multiphaseInterFoam are explained.
OpenFOAM for beginners: Hands-on trainingJibran Haider
NOTE: A NEW VERSION OF THIS PRESENTATION IS AVAILABLE ON MY RESEARCH GATE ACCOUNT
(https://www.researchgate.net/publication/327594760_OpenFOAM_course_for_beginners_Hands-on_training)
OpenFOAM is an open source Computational Fluid Dynamics software package based on C++ programming language within the context of cell centred Finite Volume Method. It is developed primarily by OpenCFD Ltd and distributed by OpenCFD Ltd and the OpenFOAM Foundation.
Disclaimer:
This offering is not approved or endorsed by OpenCFD Limited, producer and distributor of the OpenFOAM software and owner of the OPENFOAM® and OpenCFD® trade marks. "
Flow and Noise Simulation of the NASA Tandem Cylinder Experiment using OpenFOAMCon Doolan
15th AIAA/CEAS Aeroacoustics Conference.
The NASA Tandem Cylinder experiment has been simulated for the case where the cylinders were placed 3.7 diameters apart (center-to-center). This configuration allows vortex shedding to occur in the inter-gap region between the cylinders. Two-dimensional, unsteady Reynolds averaged Navier Stokes flow simulations were performed using the OpenFOAM open source code. Simulated mean and unsteady flow results compare well with published experimental data. The major discrepancies between numerical and experimental flow results can be attributed to neglecting the spanwise velocity component during simulation. Acoustic computations were made using two-dimensional flow data and a compact form of Curle's theory with spanwise and temporal statistical models that introduced random perturbations into the time-domain signals. The upper and lower frequency limits of the acoustic simulation method were selected using arguments based on acoustic compactness and an estimate of near-field acoustic effects. Acoustic simulation results compare well with experiment about the main tone. Further improvements are necessary to broaden tones at the harmonics.
Full tutorial to start with OpenFOAM: run tutorials, adapt tutorials, single phase flow, immiscible two-phase flow, grid complex geometries, program equations.
3. A. Albadawi et al. (2013)
A. Albadawi et al., Int. J. Multiphase Flow, 53, 11-28 (2013).
S-‐CLSVOF
(Simple
Coupled
Volume
of
Fluid
with
Level
Set
method)
Air
Air
water
OpenFOAM
実験
VOF法(interFoam)
S-‐CLSVOF法
実験
誤差大
誤差小
脱離時間
約35~50%
脱離体積
約25%
脱離時間
約2%
脱離体積
約3%
今回はS-‐CLSVOF法の実装とその検証
4. interFoam (VOF法)
• ⽀支配⽅方程式
Navier-‐‑‒Stokes 式
流流体率率率αの移流流⽅方程式
sk
gP
t
δσ
ρν
σ
σ
nF
Fvvv
v
=
++∇+−∇=∇⋅+
∂
∂ 2
::
liquid
phase
::
interface
::
gas
phase
1=α
0=α
10 <<α
液相領域
固相領域
( ) 0=⋅∇+
∂
∂
l
t
vα
α
( ) 0=⋅∇+
∂
∂
vα
α
t
( )( ) 01 =−⋅∇+
∂
∂
g
t
vα
α
小文字l,
gはそれぞれ液相、気相を表す。
( )
glr
gl
vvv
vvv
−=
−+= αα 1
vr:
相関速度(圧縮速度)
再定義
ρ =αρl +(1−α)ρg
µ =αµl +(1−α)µg
( ) 0=⋅∇+
∂
∂
vα
α
t
CSFモデル
15. 参考⽂文献
1. M. M. Francois et al., J. Comput. Phys. 213 (2006) 141-173.
2. A. Albadawi et al., Int. J. Multiphase Flow 53 (2013) 11-28.
3. ドゥジェンヌ・ブロシャール-ヴィアール・ケレ共著
奥村剛訳, 表⾯面張⼒力力の物理理学 第2版,吉岡書店