Using Open Source CAE Software Efficiently
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1 Using Open Source CAE Software Efficiently Hannes Kröger c Copyright silentdynamics GmbH 1/24
2 Contents nsightcae Analysis Examples Summary nsightcae Analysis Examples Summary 2/24
3 What it is about nsightcae Analysis Examples Summary Common practice: manual analysis workflow: CAD Solving Meshing Geometry Postproc. Documentation i i i i i {z labour consuming } potentially complicated, error prone nsightcae: automated workflow: Report CAD GU Geometry i i i 3/24
4 Why Automation nsightcae Analysis Examples Summary Automated workflow, to avoid errors to increase productivity, speed assist inexperienced users 4/24
5 Why Automation nsightcae Analysis Examples Summary and implement best practice by experts for users Bundle all software components 5/24
6 Applications nsightcae Analysis Examples Summary Applications in mind Design computations Optimization manual investigation of many variants automatic computation of many variants, e.g. by DAKOTA Quality control implementation of testsuites and a standardized way for perfoming certain analyses 6/24
7 Possibilities for Workflow Automation nsightcae Analysis Examples Summary 1. Shell scripts Pro: simple, next logical step after command line Con: limited, even floating point arithmetics is a mess 2. Python scripts Pro: scalable, much freedom Con: if project grows large: very difficult to debug and maintain 3. C++ project Pro: mature, all possibilities, best maintainability Con: programming skills, more boilerplate in project setup nsightcae is written in C++ with python wrappers 7/24
8 How To Get nsightcae nsightcae Analysis Examples Summary nsightcae is an open source project (GPL) Source Code: nstall packages available. nstall on current Ubuntu LTS: $ $ 3 $ 4 $ add-apt-repository apt-key adv --recv-key --keyserver keys.gnupg.net 79F5CBA4 apt-get update apt-get install insightcae-base Build from sources: $ $ 3 $ 4 $ 1 sudo sudo sudo sudo git clone git://git.code.sf.net/p/insightcae/code insight-src mkdir insight && cd insight ccmake../insight-src make Add to your ~/.bashrc: source /path/to/insight/bin/insight_setenv.sh existing OpenFOAM installations will be detected. kdevelop DE can used for coding 8/24
9 Additional Services nsightcae Analysis Examples Summary Not uploaded into public repository: execution-ready workflows (organized in add-ons) ship resistance propeller / turbomachinery analysis hydrodynamics bearing analysis 9/24
10 Features nsightcae Analysis Examples Summary Create the OpenFOAM by combining case elements with case builder $ isofcasebuilder 10/24
11 Features nsightcae Analysis Examples Summary Case builder can also assign boundary conditions and create field files 11/24
12 Features nsightcae Analysis Examples Summary GU for editing parameters / run analyses / view results ( workbench ) Parameters Documentation / Help Alternative: Command line tool to perform analyses ( analyze ) $> analyze --double LaheadByL:2.3 inputfile.ist 12/24
13 Features nsightcae Analysis Examples Summary CAD module emphasis on model processing import model from any source based on OpenCASCADE, import of GES, STEP, BREP models are described by scripts graphical interpreter for scripts ( iscad ) more features: Figure: screenshot of iscad entity selection by filtering commands, e.g. inlet=model.faces( isplane && min(facecog.x) ) meshing (through gmsh) fully parametric parts, constraint-based sketches, assemblies, part library, drawing export (DXF) 13/24
14 OpenFOAM Support nsightcae Summary in toolkit : Analysis Examples Execution of OpenFOAM commands through batch systems When generating case setups, differences for multiple OpenFOAM version is accounted for (1.6-ext, 2.1, 2.2, 2.3) Reasonable default solver settings for a number of solvers Dictionary parser direct additions for OpenFOAM are included as well: FEMDisplacement-BC for (steady) FS with Code_Aster additional discretization schemes localized limited schemes for interpolation, gradient and sn-gradient additional tools for post processing additional BCs: inflowgenerator for LES/DNS 14/24
15 Analysis Modules nsightcae Analysis Examples Summary simple generic analysis modules for validation ( modules ) channel flow flat plate 2D airfoil... 15/24
16 Workflows in Python Scripts nsightcae Analysis Examples Summary Addtional workflows can be created as python scripts see slides to training yesterday 16/24
17 Addons nsightcae Analysis Examples Summary Addons are loadable containers for specific analysis modules. They need to be created for the specific problem under consideration Available so far: 17/24
18 Addon ship nsightcae Analysis Examples Summary Ship resistance analysis CFD (OpenFOAM) of ship resistance single phase (simplefoam) single phase with free surface (potentialfreesurfacefoam) two phase (interfoam or LTSnterFoam) two phase with trim and sinkage (LTSnterDyMFoam) Ship Base (Meshing) Single Phase / Fixed Attitude Result Report Two Phase / Fixed Attitude CAD Two Phase / Trim + Sinkage 18/24
19 Addon ship nsightcae Analysis Examples Summary inheritance: meshing is (almost) the same for all analyses minimum parameters: geometry of domain can be computed from given STL geometry single parameter for resolution nax BL thickness is estimated, y + is set accordingly 19/24
20 Addon propeller nsightcae Analysis Examples Summary Marine propeller and propulsion analysis CFD (OpenFOAM) of single operation points and open-water curves (meta analysis) CAD free propeller ducted propeller axial pump optimal diameter, optimal rpm, propulsion prognosis Propeller Open Water Curve Analysis Propeller Analysis J=0.7 Propulsion Prognosis Propeller Analysis J=0.5 Propeller Analysis J=0.1 20/24
21 Addon hydro_bearing nsightcae Analysis Examples Summary Hydrodynamic bearing analysis CFD (OpenFOAM) of hydrodynamic bearings, single excentricity or characteristic curve/field (meta analysis) circular journal bearing multi-segment journal bearing multi-segment journal bearing with fluid-structure interaction (Code_Aster) Figure: Journal bearing characteristic map 21/24
22 Future Developments nsightcae Analysis Examples WiP: Web-Frontend ( web-workbench ) for usage e.g. in on-premise clouds ntegration in graphical programming language (DCE?) Windows version of Workbench (Remote execution of external tools on linux machine or cluster) Summary Geometry file Report 22/24
23 Summary nsightcae Analysis Examples Summary nsightcae shall be an automation framework for analysis tasks, connect multiple necessary tools, encapsulate complicated workflows, thus help reducing errors and increase quality of daily work 23/24
24 End nsightcae Analysis Examples Summary Thank you for your attention! Dr.-ng. Hannes Kröger Tel.: /24
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