datasetmeca:flow2dpastosccylinder1
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Table des matières
2D flow around an oscillating cylinder - $Re_{H}= 185$
Numerical study based on the publication of Pham et al., Journal of Marine Science and Technology, Vol. 18, No. 3, pp. 361-368 (2010)
The motion of the cylinder is vertical and forced with a sinusoïdal function
The motion of the cylinder is vertical and forced with a sinusoïdal function
Author : Y. Fraigneau CNRS-LIMSI (yann.fraigneau@limsi.fr)
Date : July 2016
Location : /DATABASE_2DFLOW_AROUND_OSCILLATING_CYLINDER_DNS
Simulation type : DNS (Sunfluidh code)
Simulation settings
2D sketch
Referential : cartesian geometry
- axes :
- x(i) : downstream direction
- y(j) : normal direction
- origin :
- $x_0= 0$ : centre of cylinder body
- $y_0= 0$ : mid-height
Reference scales
- Density : mass density of the fluid ($\rho_0$)
- Length : cylinder diameter ($D$)
- Velocity : velocity at inlet ($U_0$)
- Dynamic viscosity : dynamic viscosity of the fluid ($\mu_0$)
- Reynolds number : $Re_H= \frac{\rho_0.U_0.D}{\mu_0}= 185$
- Strouhal number : $St_0=\frac{f}{f_0}$ (oscillating-cylinder frequency $f$ over vortex-shedding frequency $f_0$ when the cylinder is at rest)
- motion magnitude : $A \times D$ (where A is the motion factor)
Non-dimensionalised data
- velocity : $U^*=\frac{U}{U_0}$
- density : $\rho^*= \rho/\rho_0= 1$
- coordinates : $x*=\frac{x}{D}$, $y^*=\frac{y}{D}$
Computational domain
- Domain scope
- computational domain size
- Downstream direction(x) : $L_x^*= 90.0$ (upward part $L_u= 40$, downward part $L_d=50$)
- Normal direction (y) : $L_y^*= 80.0$
- Oscillating cylinder (vertical oscillating motion around the mid-height of the domain)
- centre position at rest : $x_c= 0.0$ and $y_c= 0.0$
- diameter: $D^*= 1$
- oscillation frequency : $St= 0.95$ or $St= 1.2$
- The cylinder is modeled with a pseudo-penalisation method (Pasquetti et al., Applied Numerical Mathematics, 2008)
- Boundary conditions
- Inlet : imposed pressure uniform velocity ($U_0=1$)
- Outlet : Orlansky type
- ends condition : symmetry
- Spatial resolution
- mesh size : $480 \times 480 $ (576.000 cells)
- About cell-size
- $\Delta x*$ : from $0.0125$ to $0.78785$$ (downstream direction)
- $\Delta y*$ : from $0.0125$ to $0.65924$ (normal direction)
Data Recording : information about data types
- Time series
- from probes
- Physical quantities : velocity components along x and y directions (u,v) and pressure (p)
- 1 probe
- Time step= $2 \,10^{-2}$ time unit
- Time range : 400 to 600 time units
- Location : Xi= 3.5 , Xj=0.0
- File name (per physical quantity): x_ins_00000.d with x= u,v,p
- about cylinder motion
- center position as a function of time (ASCII file ibm_position01.dat)
- cylinder velocity as a function of time (ASCII file ibm_velocity01.dat)
- global force components applied to the cylinder (ASCII file ibm_force01.dat)
- force contributions exerted on the moving cylinder (ASCII file ibm_force_contribution01.dat, the four last columns can be ignored)
- 3D snapshots
- Instantaneous fields : velocity components in x, y and z directions (U,V), the pressure (P) and the phase function related to the body motion (TRACE)
- Recording rate : 0.4 time unit
- Time range from from 200.0 to 600.0 time units
- File name : res_xxxxx_yyyyyyy.d
- MPI subdomain ID: 0
- Time ID : from 3 to 502
Database organisation
Data size : ~ 7 Go
Main directory : /vol/DATABASE_MECA/DATABASE_2DFLOW_AROUND_OSCILLATING_CYLINDER_DNS
For more details about files, see the the wiki doc of Sunfluidh
Intermediate directories (four cases of study)
- $St= 0.95$ and $A= 0.2$ - directory : CAS_F0.95_A0.2
- $St= 0.95$ and $A= 0.2$ - directory : CAS_F0.95_A0.5
- $St= 1.20$ and $A= 0.2$ - directory : CAS_F1.2_A0.2
- $St= 1.20$ and $A= 0.2$ - directory : CAS_F1.2_A0.5
Endpoint directories & files
/DATASETUP : ASCII files input data file for sunfluidh : input3d.dat /GRID : ASCII files input data file : data_meshgen.d grid files for sunfluidh: maillx.d, mailly.d, maillz.d /SNAPSHOTS : snapshots binary files res_xxxxx_yyyyyyy.d /TIMESERIES : ASCII files u_ins_00000.d , v_ins_00000.d and p_ins_00000.d (timeseries of the velocity components and pressure from probe) ibm_position01.dat, ibm_velocity01.dat (about cylinder motion) ibm_force01.dat, ibm_force_contribution01.dat (about forces exerted on the cylinder)
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datasetmeca/flow2dpastosccylinder1.1605774866.txt.gz · Dernière modification : 2020/11/19 09:34 de yann