Marine CFD applications using OpenFOAM
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1 Marine CFD applications using OpenFOAM Andrea Penza, CINECA 27/03/2014
2 Contents Background at CINECA: LRC experience CFD skills Automatic workflow Reliability workflow
3 OpenFOAM solvers for marine CFD analysis 6DOF/2DOF solver: " interdymfoam (dynamics, transient, optional wave motion)" fully explicit mules: CFL mandatory" " Unsteady 0DOF:" interfoam (transient captive) " 0DOF (captive): " LTSInterFoam (Local Time Stepping (quasi-static hypothesis), suitable for automation and large computational campaign)"
4 OpenFOAM: CFD mandatory
5 CFD Model ① High Reynolds simulation: RANS model employed ② Turbulence model: k-ω SST ③ Wallfunction enabled: y+ 70 Ø Standard DTMB-5415 bare hull modeled
6 CFD model for marine applications
7 CFD comparison method
8 Unsteady captive - CFD Results
9 OpenFOAM vs commercial CFD (GS)
10 OpenFOAM velocity field Symmetry well caught by the solver in the velocity field Ø computations
11 Pressure field over hull
12 Free surface visualization
13 CFD results: agreement with theory
14 DTMB-5414: half hull simulations
15 CFD skills applied to AC72 issues Two phase High Reynolds RANS CFD analysis Free surface simulation of high performance boat (AC72 kat) and appendages 3D complex geometries meshing Highly automated meshing process of 3D complex shapes; fullystructured, hybrid or unstrucutured mesh on problem demand. Aerodynamics Aerodynamic of high Reynolds number RANS simulation of 3D bodies; high parallel CFD computations 2D airfoil design Wing section efficient RANS simulation. Airfoil design optimization based on RANS code data
16 Marine CFD automatic workflow
17 OpenFOAM automatic workflow evaluation Automation ① Accuracy ② Scalability ③ Reliability Ready to CFD production on HPC cluster
18 Wigley-hull Ø Description: widely used in marine engineering for validation of measures Ø Standard reference
19 Accuracy: CFD vs experimental Ø Wigley-hull wave different Froude number
20 Accuracy: mesh sensitivity Ø Fixed Froude number. On purpose degradation of mesh reducing number of cells to investigate how total computed forces become (in)accurate Ø Considerable advantages in elapsed time required Ø Mesh size range [% cells respect to gold-standard mesh]: 5.0% - 8.0% - 36.% % (gold-standard) Ø Cores range: 12 PLX, CINECA cluster
21 Accuracy: mesh sensitivity Mesh-size F value [N] F diff% 100% 3,03 Used-as-GS 36% 3,05 0,6% 8% 2,98 1,6% 5% 2,93 3,3% Ø Reducing mesh size in not critical for the absolute convergence but just delays it. Ø 5% size mesh respect to GS produces a 3% discrepancy in the total computed drag Ø 5% size mesh respect to GS requires just 12 cpu to reach convergence Ø User choice: different accuracy, different mesh size, different cost.
22 Scalability Ø Different elapsed time due to different used computational cores Ø Fixed mesh size: 1.7 M cells Ø Cores range: PLX, CINECA cluster Ø Fixed number of iterations: 5000 (up to convergence) Ø Key value indices: elapsed-time, speedup, efficiency
23 Scalability results Ø Convergence reached in 2h Ø High efficiency up to 24k cells/core
24 Reliability Ø Different computed forces due to different Froude number e.g. inlet velocity Ø Fixed mesh size: 1.7 mln cells Ø Fixed number of cores: PLX, CINECA cluster Ø Froude number range: Ø Key value indices: total forces, viscous forces, pressure forces, wave height
25 Reliability: results Ø Stable solution reached within 4s (4k iteration for LTS solver) Ø Fixed cut-off at 6s. Ø Stable means are computed in the selected range 4s 6s, so 36 cpu exploiting best scalability
26 Wave elevation (α = 0.5)
27 Pressure & axial velocity Pressure over boat hull Axial (x) velocity over wave 3D surface
28 Hands-on: CFD result DTC Hull tutorial: $FOAM_TUTORIALS/multiphase/ LTSInterFoam/DTCHull
29 Hands-on: OpenFOAM commands ① CAD transformation: scaling, trim, sink Ø surfacetransformpoints scale -yawpitchroll -translate ⑤ Decompose domain: Ø Edit system/decomposepardict Ø Run decomposepar ⑥ Run solver: ② Setup constants: Ø Edit constant/transportproperties Ø Edit constant/rasproperties ③ Setup BCs: Ø Edit 0.org files ④ Setup free surface initial position: Ø Edit system/setfielddict Ø Run setfields Ø mpirun np LTSInterFoam -parallel ⑦ Reconstruct domain Ø Run reconstructpar
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