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d. Close the Dynamic Mesh Zones dialog box.

23.4.8. Solution Animations

By setting up animation definitions, you will be able to capture results for your transient simulation as it calculates the solution, so that you can later display how the fluid flow and flap shape change over time.

1.Create a scene that can be used in an animation definition for the fluid flow.

Scenes are used when you want to display multiple graphics objects within a single window. In this case, the animation will include not only contours of the fluid velocity, but also boundary zones.

Results → Scene New...

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Setup and Solution

a.Enter vel_bound for the Name.

b.Click New Object and select Mesh... from the drop-down list to open the associated dialog box.

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i.Enter boundaries for the Mesh Name.

ii.Disable the Faces option.

iii.Deselect all surfaces in the Surfaces selection list by clicking , and then select flap_wall, po.3, velocity_inlet.1, and wall.

iv.Click Save/Display and close the Mesh Display dialog box.

c. Click New Object and select Contours... from the drop-down list to open the associated dialog box.

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Setup and Solution

i.Enter vel_mag for the Contour Name.

ii.Select Velocity... and Velocity Magnitude from the Contours of drop-down lists.

iii.Disable the Auto Range option and enter 68 and 87 for the Min and Max, respectively.

Disabling the Auto Range ensures that all of the results in the animation have the same scale. The velocity of the fluid will not change very much in this particular solution, and so using a narrow range of values will make it easier to identify the small contour changes.

iv.Deselect all surfaces in the Surfaces selection list by clicking .

For 2D cases, if no surface is selected, contouring is done on the entire domain.

v.Click the Save/Display button and close the Contours dialog box.

d. Click the Save & Display button, and then click Cancel to close the Scene dialog box.

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2. Create an animation definition for the fluid velocity and boundaries scene.

Solution → Calculation Activities → Solution Animations New...

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Setup and Solution

a.Enter vel_animation for the Name.

b.Enter 5 for Record after every and select iteration from the drop-down list.

c.Select In Memory from the Storage Type drop-down.

The In Memory option is acceptable for a small 2D case such as this. For larger 2D or 3D cases, saving animation files with either the PPM Image or HSF File option is preferable, to avoid using too much of your machine’s memory.

d.Select vel_bound from the Animation Object list.

e.Make sure that the Window Id is set to 3.

f.Click OK to create the animation definition.

3.Create a field function that can be used in an animation definition for the total displacement of the flap.

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This function will calculate the total displacement using the displacement components along each axis, and is based on the Pythagorean theorem for two dimensions.

Parameters & Customization → Custom Field Functions New...

a.Click the SQRT button on the calculator pad to add sqrt to the Definition field.

b.Click the ( button.

c.Select Structure... and X Displacement from the Field Functions drop-down lists and click the Select button.

d.Click the X button.

e. Continue in this manner to complete the Definition shown in the previous figure: sqrt (x-dis- placement * x-displacement + y-displacement * y-displacement).

Tip

If you make a mistake, click the item you added to the function

DEL button on the calculator pad to delete the last definition.

f.Enter total-displacement for the New Function Name.

g.Click Define and close the Custom Field Function Calculator dialog box.

The total-displacement item appears under the Parameters & Customization / Custom Field Functions branch in the Outline View.

4.Create an animation definition for the flap displacement.

Solution → Calculation Activities → Solution Animations New...

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Setup and Solution

a.Enter disp_animation for the Name.

b.Enter 5 for Record after every and select iteration from the drop-down list.

c.Select In Memory from the Storage Type drop-down.

d.Click New Object and select Contours... from the drop-down list to open the associated dialog box.

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i.Enter disp for the Contour Name.

ii.Select Custom Field Functions... and total-displacement from the Contours of drop-down lists.

iii.Disable Auto Range and enter 0 and 7.07e-05 for Min and Max, respectively.

iv.Select solid.5 from the Surfaces list.

v.Click Save/Display and close the Contours dialog box.

e.Select disp from the Animation Object list.

f.Make sure that the Window Id is set to 4.

g.Click OK to create the animation definition.

5.Create an animation definition for the mesh.

Solution → Calculation Activities → Solution Animations New...

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Setup and Solution

a.Enter mesh_animation for the Name.

b.Enter 5 for Record after every and select iteration from the drop-down list.

c.Select In Memory from the Storage Type drop-down.

d.Click New Object and select Mesh... from the drop-down list to open the associated dialog box.

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