RD-3590: Fluid Flow through a Rubber Clapper Valve

The objective of this tutorial is to simulate the flow of water through a rubber valve using an inlet option in multi-phase material law (Law 51). In this model the top chamber is air, the lower chamber is water, and the bottom row of elements is the inlet. Law 51 is used for air, water and inlet. Boundary conditions are applied on each surface of fluid in its normal direction. An interface between fluid and rubber (CEL) is defined to manage the contact.

Exercise

Step 1: Load the RADIOSS User Profile

1.	Launch HyperMesh Desktop.

2.	From the Preferences menu, select the User Profiles or click the icon in toolbar.

3.	Select RADIOSS (Block140) and click OK.

Step 2: Load the valve.hm file

1.	From the toolbar, click the Open Model icon to open the valve.hm file you saved to your working directory from the radioss.zip file. Refer to Accessing the Model Files.

2.	Click Open. The model loads into the graphics area.

Step 3: Creating curves for pressure_inlet

1.	Launch the HyperMesh Solver browser from View > Browsers > HyperMesh > Solver.

2.	In the Solver browser, right-click and select Create > FUNCT. The Curve editor dialog box opens.

3.	In the Curve editor window, click New.

4.	For the Name, enter pressure_inlet and click proceed.

5.	From the Curve editor window, select pressure_inlet from the curve list.

6.	Enter the X and Y coordinates, as shown below.

rd3590_pressure_inlet-202

7.	Click Update.

8.	Follow Steps 3.3 - 3.7 to create a curve named density, with the values shown below.

rd3590_density

9.	Click Close.

Step 4: Define and assign Material, Property to component inlet

1.	In the Model browser, right-click and select Create > Material. The new material appears in the Entity Editor.

2.	For Name, enter inlet-water.

3.	For Card Image, select MLAW51 and click Yes to confirm.

4.	Input the values, as shown below:

Remember to select ALE under ALE CFD Formulation.

rd3590_inletwater_14

rd3590_rows_13

5.	In the Model browser, right-click and select Create > Property to create a new property.

6.	For Name, enter solids.

7.	For Card Image, select P14_SOLID. Keep all the default settings.

8.	Click Yes to confirm.

9.	In the Model browser, click on the inlet component and assign solids as the Prop_Id and inlet-water as the Mat_Id.

Step 5: Define and assign Material, Property to component Air

1.	In the Model browser, right-click and select Create > Material. The new material appears in the Entity Editor.

2.	For Name, enter air.

3.	For Card Image, select MLAW51 and click Yes to confirm.

4.	Input the values, as shown below.

Remember to select ALE under ALE CFD Formulation.

rd3590_air_13

rd3590_rows2_13

5.	Click on the air component in the Model browser and assign solids as the Prop_Id and air as the Mat_Id.

Step 6: Define and assign Material, Property to component Water

1.	In the Model browser, right-click on the material air and click Duplicate. Edit the material parameters and table data with the following changes.

2.	Change the Name to water.

3.	Set C0(1) to 1.0e-04.

4.	Change the value for Alpha(1) to 1.0 and Alpha(2) to 0.0.

5.	Change Rho_Initial to 1.000e-06.

6.	In the Model browser, right-click on the water component and select Assign. Assign solids as the Prop_Id and water as the Mat_Id.

Step 7: Define and assign Material, Property to component Rubber

1.	In the Model browser, right-click and select Create > Material.

2.	For Name, enter rubber.

3.	For Card Image, select M1_ELAST.

4.	Enter the following properties:

Rho_Initial = 1e-6 kg/mm3

E = 0.7

Nu = 0.4

5.	In the Model browser, right-click and select Create > Property.

6.	For Name, enter rubber.

7.	For Card Image, select P14_SOLID.

8.	Set ISOLID to 12.

9.	In the Model browser, right-click on the rubber component and select Assign. Assign rubber as the Prop_Id and rubber as the Mat_Id.

Step 8: Define an Interface between Rubber and Fluid

1.	Open the Solver browser and right-click to select Create > ALE-CFD-SPH > INTER_TYPE18.

2.	For Name, enter rubber-fluid, and for Card Image, select TYPE18.

rd3590_rubber_fluid_13

3.	To set the Surf_id (M), change the selector to Components and select the rubber component.

4.	To set the Grnod_id (S), change the selector to Components and select all the comps, except rubber.

Step 9: Create Boundary Conditions on outermost faces of solid comps

1.	Click Tools > BCs Manager.

2.	For Name, enter constraint-X, set Select type as Boundary Condition and set the GRNOD to Nodes.

3.	Click Nodes and select a node for each outer face parallel to x-axis.

4.	Click Nodes in the panel and select by face.

HyperMesh will automatically select all nodes in the face.

rd3590_bc_constrain-x

rd3590_constrainX_10SA1

5.	Click Create.

6.	Repeat Steps 9.1 to 9.5 to create Boundary conditions on Y and Z faces (see image below for reference).

7.	Check the box Ty in order to constrain the translational d.o.f in Y-direction, as shown below:

rd3590_bc_trans-Vy

Boundary conditions for Y-axis

8.	Check the box next to Tz in order to constrain the translational d.o.f in Z-direction, as shown below:

rd3590_bc_Z-axis

Boundary conditions for Z-axis

Step 10: Create Boundary Condition to fix one end of the rubber

1.	For Name, enter Fix-rubber, set Select type to Boundary Condition and set the GRNOD to Nodes.

2.	Select all the nodes on the edge of the clapper, as shown below.

3.	Constraint all the translational degree’s of freedom.

rd3590_fix_rubber_13

4.	Click Create to create the constraint.

rd3590_bc_fix-clapper

Step 11: Create output requests an control cards

1.	Launch the HyperMesh Solver browser from View > Browsers > HyperMesh > Solver.

2.	Right-click in the Solver browser general area to create the cards shown below with the given values for each parameter:

Keyword Type	Keyword	Parameter	Parameter Value
CONTROL CARDS	TITLE	Status	[Checked]
CONTROL CARDS	TITLE	TITLE	CLAPPER
CONTROL CARDS	MEMORY	Status	[Checked]
CONTROL CARDS	MEMORY	NMOTS	40000
CONTROL CARDS	SPMD	Status	[Checked]
CONTROL CARDS	IOFLAG	Status	[Checked]
CONTROL CARDS	ANALY	Status	[Checked]
ALE-CFD-SPH	ALE_CFD_SPH_CARD	Status	[Checked]
ALE-CFD-SPH	ALE_CFD_SPH_CARD	ALE_Grid_Velocity	[Checked]
ALE-CFD-SPH	ALE_CFD_SPH_CARD	GridVel_Gamma	100.00
ALE-CFD-SPH	ALE_CFD_SPH_CARD	GridVel_Cwx	1.00
ALE-CFD-SPH	ALE_CFD_SPH_CARD	GridVel_Cwy	1.00
ENGINE KEYWORDS	RUN	Status	[Checked]
ENGINE KEYWORDS	RUN	RunName	CLAPPER
ENGINE KEYWORDS	RUN	Tstop	50.100
ENGINE KEYWORDS	PARITH	Status	[Checked]
ENGINE KEYWORDS	PARITH	Keyword2	OFF
ENGINE KEYWORDS	PRINT	Status	[Checked]
ENGINE KEYWORDS	PRINT	N_Print	-1000
ENGINE KEYWORDS	ANIM/ELEM	Status	[Checked]
ENGINE KEYWORDS	ANIM/ELEM	VONM	[Checked]
ENGINE KEYWORDS	ANIM/ELEM	DENS	[Checked]
ENGINE KEYWORDS	ANIM/ELEM	PRES	[Checked]
ENGINE KEYWORDS	ANIM/VECT	Status	[Checked]
ENGINE KEYWORDS	ANIM/VECT	CONT	[Checked]
ENGINE KEYWORDS	ANIM/DT	Status	[Checked]
ENGINE KEYWORDS	ANIM/DT	Tstart	0
ENGINE KEYWORDS	ANIM/DT	Tfreq	0.5
ENGINE KEYWORDS	DT	Status	[Checked]
ENGINE KEYWORDS	DT	Tscale	0.5
ENGINE KEYWORDS	DT	Tmin	0.0

Step 12: Export the model

1.	Click File > Export or click the Export icon .

2.	For File:, click the folder icon and navigate to the destination directory where you want to export to.

3.	For Name, enter clapper and click Save.

4.	Click the downward-pointing arrows next to Export options to expand the panel.

5.	Click Merge starter and engine file to export solver deck as one file (or export separately).

6.	Click on Export to export solver deck.

Step 13: Run the solver using RADIOSS Manager

1.	Launch Start > Programs > Altair HyperWorks 14.0 > RADIOSS.

2.	For Input file, browse to the exercise folder and select the file clapper_0000.rad.

rd3590_radioss_mgr