Ws05_axisymflowpipe.ppt

8/12/2019 Ws05_axisymflowpipe.ppt

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WS5-1

WORKSHOP 5

AXISYMMETRIC FLOW IN A PIPE

NAS104, Workshop 5, March 2004

Copyright2004 MSC.Software Corporation


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WS5-2NAS104, Workshop 5, March 2004



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Problem Description

In this example we will analyze an axisymmetric structure for its

temperature distribution. We will use the MSC.Nastran CTRIAX6 axi-symmetric element (in its 3 node configuration) as the heat conductionelement.

The basic geometry is detailed in the figure below. A section of pipeconsisting of composite materials is divided into two different materialregions. Region A is from radius 1.5 feet to 3.5 feet. Region B is from radius3.5 feet to 4.75 feet. The overall pipe section is 5.0 feet long with an inside

diameter of 3 feet and an outside diameter of 9.5 feet.Oil flows through the interior with an inlet temperature of 100 oF and a massflow rate of 2.88E6 lbm/hr. The forced convection heat transfer coefficientbetween the oil and wall is calculated by MSC.Nastran using the followingrelationship:

Nu=0.023Re0.8Pr0.3333. Thermal conductivity properties for Region A andRegion B are 0.2 and 0.5 Btu/hr/(ft*oF). Volumetric internal heat generation

occurs in the subregion of Region B (from radius 3.5 feet to 3.9167 feet),and varies based on Z location. The heat generation is 1200*(1-Z/5)Btu/hr/ft3, where Z is in units of feet. Free convection to an ambienttemperature of 100 oF is applied to the exterior surface of the model througha heat transfer coefficient of 3.0 Btu/hr/(ft2*oF).


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Suggested Exercise Steps1. Create a new database

2. Set the solver as MSC.Nastran Thermal

3. Create the geometry

4. Mesh the fluid curve and pipe surfaces

5. Specify material

6. Define element properties

7. Define a spatial field8. Apply volumetric heat generation

9. Apply free convection to outside of model

10. Define the inlet temperature of oil

11. Define coupled flow tube convection

12.All boundary conditions13. Perform the thermal analysis

14.Attach the results file

15. Display the temperature results

16. Step 16: Quit MSC.Patran


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Step 1: Create a New Database

Create a new database

a. File: New

b. Enter axisymfor File name.

c. Click OK.

c

a

b


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Step 2: Set the Solver as MSC.Nastran Thermal

Create the geometry

a. Select Defaultfor Tolerance.

b. Select MSC.Nastranfor

Analysis Code.

c. Select Thermal for Analysis

Type.

d. Click OK.

c

a

b

d

S C G




Step 3: Create the Geometry

a. Geometry: Create/Curve/XYZ

b. Enter for Vector

Coordinates List.

c. Enter [0 0 0]for Origin

Coordinates List.

d. Click Apply.

e. Click Bottom view Icon

c

a

b

d

e

St 3 C t th G t (C t )




Step 3: Create the Geometry (Cont.)

a. Geometry: Create/Surface/XYZ

b. Enter for Vector

Coordinates List.

c. Enter [1.5 0 0]for Origin

Coordinates List

d. Click Apply.

e. Enter for Vector

Coordinates List.

f. Enter [3.5 0 0]for Origin

Coordinates List

g. Click Apply.

h. Enter for Vector

Coordinates List.

i. Enter [3.9167 0 0]for OriginCoordinates List

j. Click Apply. d

b

c

j

h

i

g

e

f




Step 3: Create the Geometry (Cont.)

St 4 M h th Fl id C d Pi S f




Step 4: Mesh the Fluid Curve and Pipe Surfaces

Mesh the curve representing thefluid(oil) and surfaces for thepipe.

a. Element: Create/MeshSeed/One Way Bias.

b. Enter 10for Number.

c. Enter 2.0for L2/L1.d. Enter Curve 1Surface 1.4 3.2

for Curve List.

e. Click Apply.

f. Element:Create/Mesh/Surface.

g. Select Triafor Elem Shape.

h. Enter IsoMeshfor Mesher.

i. Enter Tria3for Topology.

j. Enter Surface 1:3for SurfaceList.

k. Enter 0.25for Value of GlobalEdge Length.

l. Click Apply.

c

a

b

j

i

g

h

f

d

e

k

l


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St 4 R C i id t N d




Step 4: Remove Coincident Nodes

Connect elements

a. Elements: Equivalence/All

Tolerance Cube.

b. Enter 0.005

c. Click Apply.

c

a

b

Step 5: Specify Material




Step 5: Specify Material

Create isotropic material property

for Region A.

a. Materials:

Create/Isotropic/Manual

Input.

b. Enter mat_afor Material Name.

c. Click Input Properties

d. Select Solid propertiesfor

Constitutive Model.

e. Enter 0.2for Thermal

Conductivity.

f. Click OK.

g. Click Apply.

c

a

b

g

f

d

e

Step 5: Specify Material (Cont )


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Step 5: Specify Material (Cont.)

Specify isotropic material property

for Region B.

a. Materials:


Input.

b. Enter mat_bfor Material Name.


d. Select Solid properties.


Conductivity.

f. Click OK.

g. Click Apply.

c

a

b

f

d

e

Step 5: Specify Material (Cont )


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Step 5: Specify Material (Cont.)

Specify material property for oil

a. Materials:


Input.

b. Enter oilfor Material Name.


d. Select Fluid propertiesfor

constitutive Model.


Conductivity.

f. Enter 0.44for Specific Heat.

g. Enter 56.8for Density.

h. Enter 100.08for Dynamic

Viscosity.i. Click OK

j. Click Apply.

c

a

b

j

i

gh

f

d

e

??

Step 6: Define Element Properties


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Step 6: Define Element Properties

Define axisymmetric element

properties for Region A.

a. Properties: Create/2D/

Axisym Solid.

b. Enter pipe_afor Property Set

Name.


d. Click in Material Namebox and

select mat_aunder Material

Property Sets.

e. Click OK.

f. Enter Surface 1for Select

Members.

g. Click Add

h. Click Apply

c

a

b

g

h

f

d

e

Step 6: Define Element Properties (Cont )


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Step 6: Define Element Properties (Cont.)

Define axisymmetric element

properties for Region B.

Properties: Create/2D/Axisym

Solid.

Enter pipe_bfor Property Set

Name.

Click Input Properties

Click in Material Namebox and

select mat_bfor Material

Property Sets.

Click OK.

Enter Surface 2 3for Select

Members.

Click Add.

Click Apply.

c

a

b

g

h

f

d

e

Step 6: Define Element Properties (Cont )


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Step 6: Define Element Properties (Cont.)

Define element properties for Bar2-

s representing the oil.

a. Properties/Create/1D/Flow

Tube.

b. Enter oilfor Property Set

Name.

c. Click Input Properties..

d. Click in Material Namebox and

select oilunder Material

Property Sets.

e. Enter 3.0for Hydraulic Diam. at

Node

f. Click OK.

g. Enter Curve 1for Select

Members.

h. Click Add.

i. Click Apply.

c

a

b

i

g

h

f

d

e

Step 7: Define a Spatial Field


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Step 7: Define a Spatial Field

Define a spatial field for heat

generation.

a. Fields: Create/Spatial/PCL

Function.

b. Enter qvol_zfor Field Name.

c. Enter 1200*(1.0-Z/5.0)for

Scalar Function.

d. Click Apply.

c

a

b

d


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Step 9: Apply Free Convection to Outside of Model


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Step 9: Apply Free Convection to Outside of Model

Define convection on outside ofRegion B.

a. Loads/BCs:Create/Convection/ElementUniform.

b. Select To Ambientfor Option.

c. Enter convfor New SetName.

d. Select 2Dfor Target ElementType.

e. Click Input Data

f. Enter 3.0for Edge ConvectionCoef.

g. Enter 100forAmbientTemperature.

h. Click OK.i. Click Select Application

Region

j. Enter Surface 3.2for SelectSurfaces or Edges.

k. Click Add.

l. Click OK.

m. Click Apply

c

a

b

j

i

g

h

f

d

e

k

l

m

Step 10: Define the Inlet Temperature of Oil


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Step 10: Define the Inlet Temperature of Oil

Define the inlet temperature.

a. Loads/BCs:

Create/Temp(Thermal)/Nodal.

b. Enter inlet_tempfor New Set

Name.

c. Click Input Data..

d. Enter 100for Boundary

Temperature.

e. Click OK.

f. Click Select Application

Region..

g. Enter Point 1for Select

Geometry Entities.

h. Click Add.i. Click OK.

j. Apply.

c

a

b

j

i

g

h

f

d

e

Step 11: Define Coupled Flow Tube Convection


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Step 11: Define Coupled Flow Tube Convection

Create convection for oil flow.

Loads/BCs:Create/Convection/ElementUniform.

Select Coupled Flow Tube.

Enter coup_flow_tubefor New SetName.

Target Element Type:1D

Region 2:2D

Click Input Data Select Advancedfor Form Type.

Enter 2.88e6for Mass Flow Rate.

Enter 0.23for Heat TransferCoefficient

Select h=k/d*coef*Re**Eqpr*Pr**forFormula Type Option.

Enter 0.8for Reynolds Exponent.

Enter 0.3333for Prandtl Exponent,Heat in.

Click OK.

Click Select Application Region

Enter Curve 1for Select Curve.

Click Add.

Click Active Listof CompanionRegion.

Enter Surface 1.4for Select Surfacesor Edges.

Click Add

Click OK

Click Apply

c

a

b

l

k

i

j

h

f

g

m

n

o

p

q

m

t

u

d

e

o

r

Step 12: All Boundary Conditions


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Step 12: All Boundary Conditions

Step 13: Perform the Thermal Analysis


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Step 13: Perform the Thermal Analysis

Perform the steady-state thermal

analysis

a. Analysis: Analyze/Entire

Model/Full Run.

b. Enter axisymfor Job Name.

c. Click Apply.

c

a

b

Step 14: Attach the Results File


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Step 14: Attach the Results File

Attach the results file

a. Analysis: Attach XDB/Result

Entities/Local.

b. Click Select Results File

c. Select axisym.xdbfor File

name.

d. Click OK.

e. Click Apply.

b

a

e

c

d

Step 15: Display the Temperature Results


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Step 15: Display the Temperature Results

Display the result

a. Results:Create/Quick Plot.

b. Select SC1DEFAULT,A1.. for

Select Result Cases.

c. Select Temperaturesfor Select

Fringe Result.

d. Click Apply.

c

a

b

d

Step 16: Quit MSC.Patran


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Step 16: Quit MSC.Patran

QuitMSC.Patrana. Select Fileon the Menu

Bar and select Quitfrom

the drop down menu

a


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Ws05_axisymflowpipe.ppt

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