Dr. Alexander Michalski, SL-Rasch GmbH Dr. Ries Bouwman, ESI Group

Slides:



Advertisements
Similar presentations
Open Source Field Operation and Manipulation
Advertisements

Chapter 10 Transient Flow Modeling
SolidWorks Flow Simulation
Fluent Overview Ahmadi/Nazridoust ME 437/537/637.
Outline Overview of Pipe Flow CFD Process ANSYS Workbench
University of Southampton Southampton, UK
EULER Code for Helicopter Rotors EROS - European Rotorcraft Software Romuald Morvant March 2001.
Svetlana Marmutova Laminar flow simulation around circular cylinder 11 of March 2013, Espoo Faculty of Technology.
The analysis of the two dimensional subsonic flow over a NACA 0012 airfoil using OpenFoam is presented. 1) Create the geometry and the flap Sequence of.
University of Western Ontario
Modelling FSI problems in ANSYS Fluent via UDF
An Eulerian Divergence Preserving Approach for Partitioned FSI Simulations on Cartesian Grids M. Mehl, M. Brenk, I. Muntean, T. Neckel, T. Weinzierl TU.
Computer Simulation of Vehicle Aerodynamic Forces and Moments Using Fluent 6.2 MSC VisualNastran 4D WorkingModel 2D Zerguy Maazouddin California State.
An Analysis of Hiemenz Flow E. Kaufman and E. Gutierrez-Miravete Department of Engineering and Science Rensselaer at Hartford.
OpenFOAM for Air Quality Ernst Meijer and Ivo Kalkman First Dutch OpenFOAM Seminar Delft, 4 november 2010.
Computational Modeling of Flow over a Spillway In Vatnsfellsstífla Dam in Iceland Master’s Thesis Presentation Chalmers University of Technology 2007.
Youngwook Kang, Cornell University Andrei Simion, The Cooper Union
Workshop 6 Modeling of Catalytic Convertor
Anaerobic Biogas Digester Modelling Using OpenFOAM and Fluent Andrew Coughtrie Civil Engineering.
Workshop 5 Centrifugal Pump
Advanced CFD Analysis of Aerodynamics Using CFX
UNICAMP THE HEIGHT OF LIQUID METHOD FOR FREE SURFACE FLOWS Flow simulations of real processes often involve fluids that are separated by a sharp interface.
Experimental and Numerical Study of the Effect of Geometric Parameters on Liquid Single-Phase Pressure Drop in Micro- Scale Pin-Fin Arrays Valerie Pezzullo,
EFFECTS OF FLEXIBLE MOTION ON TSUNAMI WALL EFFICACY HARP REU 2011 Nicholas McClendon, Rice University Mentors: H.R. Riggs, Sungsu Lee, Krystian Paczkowski.
Computer Aided Thermal Fluid Analysis Lecture 7 Dr. Ming-Jyh Chern ME NTUST.
Thermo-fluid Analysis of Helium cooling solutions for the HCCB TBM Presented By: Manmeet Narula Alice Ying, Manmeet Narula, Ryan Hunt and M. Abdou ITER.
Steady Aeroelastic Computations to Predict the Flying Shape of Sails Sriram Antony Jameson Dept. of Aeronautics and Astronautics Stanford University First.
HOW AESOP GOT A SUNTAN A fractured fairy tale (with apologies to the producers of the Rocky and Bullwinkle show) The cast of this episode: Oliver Fringer.
Image courtesy of National Optical Astronomy Observatory, operated by the Association of Universities for Research in Astronomy, under cooperative agreement.
Verification and Validation Diagram of a Control Rod Guide Tube on top of a hot box dome that has been gradually heating up. A hole was drilled here to.
Numerical study of the blade cooling effect generated by multiple jets issuing at different angles and speed into a compressible horizontal cross flow.
A TWO-FLUID NUMERICAL MODEL OF THE LIMPET OWC CG Mingham, L Qian, DM Causon and DM Ingram Centre for Mathematical Modelling and Flow Analysis Manchester.
1 CFD Analysis Process. 2 1.Formulate the Flow Problem 2.Model the Geometry 3.Model the Flow (Computational) Domain 4.Generate the Grid 5.Specify the.
Flow Simulation of a Maple Seed
Workshop 2 Transonic Flow over a NACA 0012 Airfoil
I.Z. Naqavi 1, E. Savory 1 & R.J. Martinuzzi 2 1 Advanced Fluid Mechanics Research Group Department of Mechanical and Materials Engineering The University.
Viscous Stress Terms for the RELAP5-3D Momentum Equations Adam Kraus and George Mesina RELAP5 International Users Seminar 2010 September 20-23,
CFD Pre-Lab 2 Simulation of Turbulent Flow around an Airfoil Seong Mo Yeon, and Timur Dogan 11/12/2013.
CHAPTER (III) KINEMATICS OF FLUID FLOW 3.1: Types of Fluid Flow : Real - or - Ideal fluid : Laminar - or - Turbulent Flows : Steady -
MISKAM simulation of the Oklahoma City case Márton Balczó COST 732 MC /WG meeting Madrid, December 4, 2008 Budapest University of Technology and Economics.
Workshop 3 Room Temperature Study (Part 1)
August 14 th, 2012 Comparison of compressible explicit density-based and implicit pressure-based CFD methods for the simulation of cavitating flows Romuald.
Numerical investigation on the upstream flow condition of the air flow meter in the air intake assembly of a passenger car Zoltán Kórik Supervisor: Dr.
FSI for Assessing Nerve Injury During Whiplash Motion
OVERFLOW Using OVERFLOW version 2.0y Shared, distributed and hybrid parallel processing schemes available with MPI and OpenMP Wide range of applications:
CFX-10 Introduction Lecture 1.
WS7-1 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. April 28, 2009 Inventory # Introductory FLUENT Training Workshop 7 Tank Flushing.
Compressor Cascade Pressure Rise Prediction
FALL 2015 Esra Sorgüven Öner
Tokyo 2015 A Workshop on CFD in Ship Hydrodynamics URANS Simulation of Surface Combatant using CFDShip-Iowa V.4 S. Bhushan and F. Stern IIHR-Hydroscience.
Reynolds Stress Constrained Multiscale Large Eddy Simulation for Wall-Bounded Turbulence Shiyi Chen Yipeng Shi, Zuoli Xiao, Suyang Pei, Jianchun Wang,
Structured ALE Solver. Overview Structured ALE mesh automatically generated Smaller input deck; Easier modifications to the mesh; Less I/O time. Shorter.
SPH weekly meeting Free surface flows in Code Saturne Results 23/11/2009 Olivier Cozzi.
AIAA th AIAA/ISSMO Symposium on MAO, 09/05/2002, Atlanta, GA 0 AIAA OBSERVATIONS ON CFD SIMULATION UNCERTAINTIES Serhat Hosder, Bernard.
CFD Exercise 1 Laminar & turbulent flows with COMSOL.
1 Tutorial. 2 Solution Process 1.Gather Information 2.Create the Computational Grid 3.Set the Boundary Conditions 4.Set the Initial Conditions 5.Set the.
AERODYNAMIC OPTIMIZATION OF REAR AND FRONT FLAPS ON A CAR UNIVERSITY OF GENOVA – POLYTECHNIC SCHOOL ADVANCED FLUID DYNAMICS COURSE 2015/2016 Student: Giannoni.
Chapter 10 Transient Flow Modeling
A V&V Overview of the 31st Symposium on Naval Hydrodynamics
A TWO-FLUID NUMERICAL MODEL OF THE LIMPET OWC
Workshop 6 Modeling of Catalytic Convertor
Fluent Overview Ahmadi/Nazridoust ME 437/537/637.
The application of an atmospheric boundary layer to evaluate truck aerodynamics in CFD “A solution for a real-world engineering problem” Ir. Niek van.
Efficient Parallel Simulation of Fluid Dynamics on Cartesian Grids
AIAA OBSERVATIONS ON CFD SIMULATION UNCERTAINITIES
AIAA OBSERVATIONS ON CFD SIMULATION UNCERTAINTIES
Supported by the National Science Foundation.
AIAA OBSERVATIONS ON CFD SIMULATION UNCERTAINTIES
Investigation of Flow Turning in a Natural Blockage
Presentation transcript:

A study of the Butterfly-Effect for Massively Separated Flows using OpenFOAM® Dr. Alexander Michalski, SL-Rasch GmbH Dr. Ries Bouwman, ESI Group 7th OpenFOAM Workshop

SL Rasch Architects Specialised in special buildings and lightweight structures

ESI Worldwide Operations Headquarters in Paris, France Offices in more than 30 countries Average Headcount: +900 people Over 200 Scientists WW Revenue 2010: ~100 M€ Paris, France Eschborn, Germany Pilsen, Czech Republic Farmington Hills, MI Beijing, China Tokyo, Japan

Virtual Try-Out Space VTOS

Setup - Model

Setup – Inlet Profile A wind-type velocity profile was applied at the inlet, with a law of: v(z) = 21.1 (z/10)^0.26, in m/s

Setup – Post-Processing 11 points were monitored: 3 points 5 meters upstream of the cube, at +/-20m and 0 in Y, and at 30m in Z. 4 points 5m downstream of the cube, at +/-5m and +/-15m in Y, and at 30m in Z. 4 points upstream of umbrella at 60m in X, at +/-5m and +/- 15m in Y, and at 31m in Z.

PAM-FLOW Physics: Compressible and incompressible NS solver (transient and steady flow) Turbulence models: Smagorinsky SGS (LES), K-epsilon, Spalart-Almaras, Baldwin-Lomax Law of the wall or no-slip walls (with semi-structured boundary layer mesh) Moving bodies (6-DOF rigid bodies, FSI) Boundary fitted model: ALE grid and automatic remeshing Embedded mesh Highly accurate numerical schemes, both in time and space Spatial discretisation: Edge-based finite-element and explicit/implicit NS solver, Adaptive mesh refinement Temporal discretisation: Explicit schemes (compressible flow), Implicit pressure projection explicit scheme (incompressible), Implicit matrix free LU-SGS (compressible and incompressible flow) DMP and SMP (hybrid) parallel runs. FSI: MPI coupling with VPS (PAM-CRASH) Main applications: Aeroacoustic sources characterization, Fluid Structure Interaction

Original Study PAM-FLOW Same mesh, different number of domains

Original Study PAM-FLOW Different meshes

Original Study PAM-FLOW Conclusions For different number of domains, very small differences at beginning of run grow progressively to state of total dissimilitude Actual (deterministic) instantiation completely different Mean loads remain similar Upstream of cube no differences Butterfly Effect Even very small (roundoff) errors can have a pronounced effect on actual deterministic instantiation of a flowfield Important if mean flow field is less important than actual (maximum) field

OpenFOAM High quality mesh generated using VisCART ESI proprietary cartesian automatic mesher snappyHexMesh not sufficient quality for umbrella structure Simulation performed with OpenFOAM 2.1 On RedHat Linux LES Smagorinsky Subgrid Scale model 1.800 sec real time, time step of 5msec Max Courant number of 2.0 Flow field initialised from a static flow 0 m/s in all directions Simulation was done with 3 SIMPLE partitions in X-Y-Z 8 cores: coefficients 4-2-1 32 cores: coefficients 16-2-1 64 cores: coefficients 32-2-1 in X-Y-Z)

Total Mesh size: 910k cells VisCART mesh Total Mesh size: 910k cells

OpenFOAM Study

OpenFOAM Study 15 s

OpenFOAM Study

OpenFOAM Study Although the instantaneous forces/moments as well as flow pictures are different, the average flow fields are very similar.

Conclusion Same effect seen with OpenFOAM as with PAM-FLOW Reason: Irrespective of wind data Irrespective of transient or steady state run Effect depends on number of domains Effect depends on memory preconditioner Reason: inner products of very long vectors that are distributed among domains are required Order for required additions affects iterative solver Leads to different instantiations with different number of domains

FLUENT Study