dytran案例13

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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation WS 13-6
Step 5. 3D Property Sets
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Create 3d property for use in mesh generator: a. Properties : Create / 3D / Eulerian Solid b. Enter peuler1 for Property Set Name. c. Select Hydro(PEULER1) for Options. d. Click on Select Application Region. e. Click on the left cube. f. Click Add. g. Click OK. h. Click Apply. i. Do the same for the right cube but now with property name, peuler2.
DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-2
Step 1. Create a New Database
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Create new database: a. Open File menu and click New. b. Click on Change Template. c. Click mscdytran_template.db. d. Click OK. e. Enter flow for File name. f. Click OK.
WORKSHOP 13
Container Flow
DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-1
Problem Description
● Flow between two containers through a hole
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation WS 13-9
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Step 6. Creating the First Airbag 1 (Cont.)
q. Click on Select Application Region. r. Select Enclose entire entity under picking preferences s. Select elements as shown (Element 1:9 24:32:2). t. Click Add. u. Click OK. v. Click Apply. This creates the first airbag.
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Create Subsurface for second airbag: a. Loads/BCs : Create / Airbag / Element Uniform / Subsurface b. Enter airbag2s for the New Set Name. c. Click on Input data and clear the Porosity check box. d. Click on Select Application Region. e. Select the elements that are colored brown, but do not select the hole element 32 (Element 10:18 25:31:2). f. Click Add. g. Click OK. h. Click Apply.
● Material =ideal gas ● Density = 1.162 kg/m3 ● gamma = 1.517 ● To enable flow between containers, they will be modeled as
dummy airbags. ● Containers are connected by a common hole.
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-5
Step 4. Create Material
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a. Materials : Create / Isotropic / Manual Input b. Enter gas for Material Name. c. Click on Input Properties. d. Constitutive Model: Ideal Gas (DMAT) Valid For: Eulerian Solid (Hydro) e. Enter 1.167 for Density, 1.517 for Gamma and 226.45 for R. f. Click OK. g. Click Apply.
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation WS 13-10
Step 7. Defining the Hole between Airbags
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The hole is element 32 a. Loads/BCs : Create / Airbag / Element Uniform / Subsurface b. Enter porflcpl for the New Set Name. c. Click on Input Data. d. Select the Porosity check box. e. Select PORFLCPL for Type. f. Select airbag name airbag1. g. Click OK. h. Click on Select Application Region. i. Select Elm32 as shown. j. Click Add. k. Click OK. l. Click Apply.
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-11
Step 8. Creating a Subsurface for the Second Airbag
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-7
Step 6. Creating the First Airbag 1
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a. Loads/BCs : Create / Airbag / Element Uniform / Surface b. Enter airbag1 for the New Set Name. c. Click on Input Data. d. Enter 100000 for the Environmental Pressure. e. Click in the Initial Gas Name box. f. Click Update Initial Gas List. g. Enter Initgas for Initial Gas Fraction Name. h. Click Update Gas List.
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-4
Step 3. Geometry: Create Solids for 3D Property set
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Create a dummy solid that is used in creating 3D property sets. Any solid suffices. a. Geometry : Create / Solid / Vertex b. Select all eight vertices of the left cube. c. Click Apply. (Not required if Auto Execute is selected). d. Select all eight vertices of the right cube. e. Click Apply. (Not required if Auto Execute is selected).
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-12
Step 9. Creating the Second Airbag
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Surface of Second Airbag: a. Loads/BCs : Create / Airbag / Element Uniform / Surface b. Enter airbag2 for the airbag name. c. Click on Input Data. d. Enter 100000 for Environmental Pressure . e. Click on Update Initial Gas List. f. Enter initgas2 for initial gas fraction name. g. Enter number of gasses =1 and click Create Table. h. Select infgas. i. Click Update Label. j. Enter for gas fraction 1.0. k. Click OK . l. Select initgas2. m. Click OK.
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation WS 13-8
Step 6. Creating the First Airbag 1 (Cont.)
Define the inflator gas: i. Enter infgas for Inflator Gas Name. j. Enter gas data. Spec. Gas Const. : 226.45. Sec. Heat Const. : 438.01. k. Click Apply. l. Enter Number of Gasses =1 and click Create Table. m. Click infgas . n. Click Update Label. o. Enter for Gas fraction 1.0. p. Click OK.
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DYT101, Workshop 13, February 2008 Copyright 2008 MSC.Software Corporation
WS 13-3
Step 2. Reading in Mesh-data
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Read input file: a. Analysis: Read Input file b. Click on Select Input File. c. Select geo.dat. d. Click OK. e. Click Apply. f. Click the Fit View icon.