vk.com/club152685050Using the Adjoint Solver|–vk2D.com/id446425943La inar Flow Past a Cylinder

Figure 24.16: Shape Sensitivity Colored by Sensitivity to Mass Sources (Cell Values)

This plot shows how sensitive the drag on the cylinder is to changes in the surface shape. The drag is affected more significantly if the cylinder is deformed on the upstream rather than the downstream side. Maximum effect is achieved by narrowing the cylinder in the cross-stream direction.

24.4.4.4. Exporting Drag Sensitivity Data

Before computing the sensitivity for the force-lift observable, you need to define the region that will be subject to geometry morphing, and export the drag sensitivity data so it can be used later in the multi-objective optimization.

1.Open the Design Tool dialog box.

Design → Adjoint-Based → Design Tool...

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Setup and Solution

Figure 24.17: The Design Tool Dialog Box

2.In the Region tab, define the region that will be modified for the design change.

a.Ensure that Cartesian is selected from the Region Geometry drop-down list.

b.Click Get Bounds....

c.Select wall in the Bounding Region Definition dialog box.

This will initialize the morphing region to the bounding box around the cylinder wall.

Release 2019 R1 - © ANSYS,Inc.All rights reserved.- Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.	811

vk.com/club152685050Using the Adjoint Solver|–vk2D.com/id446425943La inar Flow Past a Cylinder

d.Click Update Region to update the view of the bounding box illustration in the graphics window.

You can use the Mesh Display dialog box to also display the mesh, in order to review it prior to morphing.

e.Click Larger Region several times until the X and Y Limits are ±1.907349 m (Figure 24.18: Morphing Region Around Cylinder (p. 812)).

Figure 24.18: Morphing Region Around Cylinder

f. In the Objectives tab, click Manage Data....

	Release 2019 R1 - © ANSYS,Inc.All rights reserved.- Contains proprietary and confidential information
812	of ANSYS, Inc. and its subsidiaries and affiliates.