# Axisymmetric plot swept to 3D

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 Solution Number: 982 Title: Axisymmetric plot swept to 3D Platform: All Platforms Applies to: All Products Versions: All versions Categories: Postprocessing Keywords: revolve axisymmetric plot swept 3D

## Problem Description

How do I make a 3D plot from an axisymmetric 2D calculation?

## Solution

### COMSOL 4.2 and later

In COMSOL version 4.2 and later, axisymmetric physics interfaces will create a default 3D plot by revolving the 2D axisymmetric solution 270 degrees about the symmetry axis. For more information, you can always search the Help (press F1 in COMSOL Multiphysics), or open the electronic Documentation (press Ctrl F1 in COMSOL Multiphysics).

Figure 1: Default plot of the model library model "Terminal Falling Velocity of a Sand Grain".

### COMSOL 4.0, 4.0a or 4.1

If you have an earlier version (4.0, 4.0a or 4.1), or if you want to set up the 3D plot yourself, create a revolution data set from an existing data set. For more information, see the following sections in the manuals: Revolution 1D or 2D in the COMSOL Multiphysics Reference Guide and Defining a Revolution Data Set (1D or 2D) in the COMSOL Multiphysics User's Guide.

### COMSOL 3.5a

To postprocess the solution in a 2D axisymmetric model in full 3D, first create the corresponding 3D geometry by revolving the axisymmetric geometry about the axis of symmetry. Then use extrusion coupling variables to map the solution components from the rz-plane to the 3D coordinates. See Brief Examples of Extrusion Coupling variables in the COMSOL 3.5a User's Guide for information about the coordinate transformation and 2D Axisymmetric Transient Heat Transfer in the COMSOL Multiphysics Modeling Guide.

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