# Simcenter STAR-CCM+ Creating Circular Planes with Field Functions in Simcenter STAR-CCM+: A Step-by-Step Guide

2023-07-04T08:33:56.000-0400
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## Summary

This article explains how to create a circular section in Simcenter STAR-CCM+ for post-processing. One way to do this is by creating a field function and using it to create a plane. The article provides step-by-step instructions and an example file to help readers understand the process.

## Details

 Attachments: EquationOfCircle_1706.sim (32 MB)

To create a circular plane via a field function, follow these steps:

Define a local coordinate system at the desired location of the circular plane. In this article, the coordinate system is defined through parameters with the y-direction as the plane normal and named CircleSystem (see images 1a and 1b for the parameters and coordinate system, where the pi parameter is obtained with acos(-1)).  a)                                                                                       b)
Figure 1: a) Parameters used to define field functions and coordinate location, b) Local coordinate system

Create a scalar field function with the following form:
if x^2 + z^2 < r^2, Value = 1, else Value = 0

This can be written in Simcenter STAR-CCM+ syntax as:

(pow(\$\$Position(@CoordinateSystem("CircleSystem")),2)+pow(\$\$Position(@CoordinateSystem("CircleSystem")),2) < pow(\${Radius},2)) ? 1 : 0

Create a plane section at the desired location and create a threshold with the plane section as input using the field function created above. Setting the threshold above 0.5 will give you the circle, and setting a value lower than 0.5 will give you the outside of the circle. See the pictures below.  a)                                                                                       b)
Figure 2: a) Plane with threshold value above 0.5, b) Plane with threshold value below 0.5

The image below visualizes the z-position on the newly created circular plane. The resolution of the plane will be governed by the underlying mesh, so refining the mesh will give a smoother plane. See the area of the plane in the annotation.   Figure 3: Resolution of the derived circular part depending on the underlying mesh size. 1 - coarse, 2 - medium, 3 - fine.

There is an attached sim file made in Simcenter STAR-CCM+ 2210, to view the methodology.

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### Associated Components

Design Manager Electronics Cooling In-Cylinder (STAR-ICE) Job Manager Simcenter STAR-CCM+