# OS-T: 1070 Analysis of an Axi-symmetric Structure

In this tutorial the method of modeling an axi-symmetry problem in OptiStruct is covered.

## Launch HyperMesh and Set the OptiStruct User Profile

## Open the Model

## Exercise 1: Analysis with the Full Model

You will find that the structural model has already been set up with the necessary elements, boundary conditions, property, and material data so that it is ready to solve. Pressure load is applied on the top face of the geometry and constraints are defined at the bottom face. Note that the model is symmetrical about the z-axis and that loads and boundary conditions are symmetrical about the same axis as well. These represent the conditions necessary for modeling axi-symmetry problems. First, obtain the result for the full model and then you model a small part of the model with boundary conditions suitable to enforce the axi-symmetric behavior. Finally, you compare the results of the axi-symmetric model with the full model results.

### Submit the Job

### View the Results

#### View the Displacements of the Structure

## Exercise 2: Analysis with a Small Portion of the Full Model with Axi-symmetry Boundary Conditions

### Set up the New Analysis

Return to HyperMesh to delete the all the elements, except for a small portion and to set up the axi-symmetry boundary conditions.

### Set up the Axi-symmetry Model

### Apply the Additional Boundary Conditions

### Create Constraints

Next you will submit the job, as was complete in Exercise 1.