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ICEM-Intro


Lecture 7 Output to Solver
14.5 Release

Introduction to ANSYS ICEM CFD
? 2012 ANSYS, Inc. April 1, 2013 1 Release 14.5

Output to Solver - Selecting Solver
? Selecting solver
– – – – –
Use the red toolbox in the Output tab to select the solver format This same menu is accessed with Settings > Solver 123 solver formats available All output formats can be set with the Output Solver pulldown Help on each solver format can be found on the Ansys website: http://www.ansys.com/Products/Other+Products/ANSYS+ICEM+CFD/ Output+Interfaces/Output+Interfaces+TOC

– Also found in Help >
Output Interfaces

ABAQUS ADINA AUTOCFD CFD++ CGNS CONCERT3D

ACE-U

AcFlux

ACRi

ACUSOLVE ATTILA CFDesign

VULCAN WIND WINDMASTER

SCRYU STARCD TDF SC/Tetra STARS TGRID

AIRFLO3D ALPHA-FLOW ANSYS BAGGER CFL3D CHAD CRSOL CEDRE CFX-4 C-MOLD CRUNCH CFD-ACE CFX-5 COBALT CSP

CFX-TASCflow ZEN COMCO DATEX USM3D USMKV3V

DSMC-SANDIA DTF
FASTEST-3D FLEX FLUENT V6 GUST ICU KIVA-3 FASTU

EM
FENFLOSS

EXODUS
FIDAP

FANSC
FIRE

VECTIS
VRML

SpecElem
STL

FLOTRAN FLOWCART GASP HAWK IDEAS KIVA-4

FLOW-LOGIC FLUENT V4 GSMAC-DF ICAT iPLES LS-DYNA3D

VSAERO/USAERO TLNS3Dmb Trio_U TSAR UGRID UH3D SPECTRUM-CENTRIC TEAM TRANAIR POLY3D

GLS3D(ADH) GMTEC HDF IMPNS LAURA IBM-BEM INCA LL-DYNA3D

MACS
N3SNATUR NSU3D PATRAN

MAGREC

MAZe

MOUSE
NOPO PAB3D PMARC

MULTIBLOCK
NPARC PARC POLYFLOW

USA
SAUNA SPLITFLOW TNO

POPINDA
PRECISE RADIOSS RTT

NASTRAN NEKTON NS3D NUMECA

PHOENICS PLOT3D

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Mesh Formats
? There are 2 types of mesh formats that solvers read
– Unstructured ? Most solvers use unstructured formats ? Some examples are Fluent, Ansys CFX, CFD++, Abaqus,


i j k

Ansys ? Nodes have an ID and location ? The ICEM CFD unstructured mesh has a *.uns extension and can be made from any mesher in ICEM CFD Multiblock structured ? Some older CFD solvers require this format ? Examples are Plot3D, CFX-TASCFLOW, KIVA-3V – CGNS supports both unstructured and multiblock structured ? Nodes have IJK index designation and location ? The ICEM CFD structured mesh has many files: – Project.1, project.2, project.3, etc… for each mesh domain – A topology file, topo_mulcad_out.top, that describes how each domain is connected to the other domain. – A dummy file, Project.multiblock, that enables selection of all the multiblock mesh files of that project name by selecting this one file ? Only an ICEM CFD hexa blocking is capable of being written out in multiblock structured format
3 Release 14.5

? 2012 ANSYS, Inc.

April 1, 2013

Boundary Conditions
? Both CFD and FEA solvers allow boundary
conditions to be set

– Output > Boundary Conditions ? BC’s are set on mesh elements grouped by ?

Part highlights white when selected BC’s shown for solver Fluent_V6

? ?

part names Tree structure organizes part names by dimension (2D, 3D, etc) of geometry and mesh in the part Any part containing mixed dimensions (ex. curves and tri’s) will be grouped into mixed/unknown Use File> Attributes > Save Attributes As… to save the BC file (*.fbc and *.atr extensions)

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Parameters
? Some structural solvers have global parameters
– Output > Edit Parameters ? If the solver type requires global parameters, you must ?
bring up this menu before writing out and press Accept, even if not changing any parameters Then use File > Parameters > Save Parameters As… to save the file (*.par extension)

Example parameters shown for ANSYS solver
? 2012 ANSYS, Inc. April 1, 2013 5 Release 14.5

Write Input
? Output > Write Input to write the solver file



– It will ask you to save a boundary condition file





? 2012 ANSYS, Inc. April 1, 2013

(*.fbc) and the project It’s always safe to save these when asked, but not necessary if you know you saved them and didn’t make any changes since then It will then ask for the ICEM CFD mesh file to translate ? *.uns file if the solver requires an unstructured mesh ? *.multiblock file if the solver requires a structured mesh A final menu will pop up that has specific options for the solver translation being used ? The example on the left is for Fluent_V6 All translators will require a boundary condition file even if no BC’s are set ? A empty BC file will contain just the part names There will always be a name for the output file
6 Release 14.5

Special Structural Solvers
? 5 Special structural solvers
– –
– There are 5 structural solvers that have extended boundary
condition setup – called loads and constraints – which are set using the Common Structural Solver dropdown These are Nastran, Ansys, LS-Dyna, Abaqus, and Autodyn These are set using the 4 extra tabs; Properties, Contraints, Loads, and Solve Options

Nastran

Ansys and Abaqus

LS-Dyna and Autodyn

? Constraints tab
– –
? 2012 ANSYS, Inc. April 1, 2013

– All functions are only available for LS-Dyna and
Autodyn “Define contact” is allowable with Ansys and Abaqus Nastran only allows the first two functions
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Special Structural Solvers - Procedure
? Define which elements to write out
– First define a material in the –
Properties tab Then define an element property on the element types and parts you want to write out ? 3D property for volume elements ? 2D property on shells ? 1D property on line elements ? 0D property on node elements

? Define any Loads and Constraints ?
– Solve Options > Write/View Input
File

in the other tabs (optional) Use the Solve Options tab to write the mesh to the solver

? Can submit solver run if the

corresponding environment variable is set to find the solver executable

– For Ansys, it is ANSYS_EXEC_PATH

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Release 14.5

Special Structural Solvers – Write Input
? If using the Properties, Loads, and

Constraints tabs for one of the 5 special structural solvers, then use the Solve Options tab to write the file, not the Output tab

– The attribute file (*.atr) is the BC file used – – –


? 2012 ANSYS, Inc. April 1, 2013

with these special structural solvers The attribute file is replaced with the boundary condition file (*.fbc) when using the Output tab Any elements set to All or None will override any properties set in the Properties tab if not set to Defined To communicate with the Output tab, click on Advanced, and then click Create Attribute & Parameter Files ? You can then Edit Parameters and Edit Attributes here or in the Output tab ? The attributes will then be the same as the boundary conditons View input file here or in your own text editor
9 Release 14.5

Wing Edit Workshop
Workshop 7.1
Mesh Repair and Export

? ? ? ? ?

Read geometry and create mesh Check mesh quality Identify areas of poor mesh Repair mesh Write out mesh to CFD Solver

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