Select Physics, Choose the Study, and Load the Geometry
1
Click the Model Wizard button.
If COMSOL is already open, you can start the Model Wizard by selecting New  from the File menu and then click Model Wizard .
2
On the Select Space Dimension page click 3D .
3
In the Select Physics tree under Structural Mechanics, expand the folder Thermal Structure Interaction , and click Thermal Stress, Solid 
4
Click Add, then click Study .
5
In the Select Study tree under General Studies, click Stationary .
6
Click Done .
7
In the Home toolbar click Import .
8
In the Settings window for Import locate the Source section.
9
From the Source list, choose COMSOL Multiphysics file.
10
Click Browse .
11
Browse to the folder Structural_Mechanics_Module\Tutorials under the COMSOL installation directory and double-click the file bracket.mphbin.
12
Below the filename, click Import .
Form Union (fin)
In the Model Builder under Component 1 (comp1) > Geometry 1 click Form Union (fin) . In the Settings window, click Build Selected (or right-click and select the same option).