Creating Iso-Surfaces in Ansys Fluent Using Journal Files
Understanding Fluent Journal Files
In Ansys Fluent, a journal file is a suitable tool designed to streamline the simulation process. It contains a list of Fluent instructions that cover the setup, execution, and post-processing phases of a simulation. These instructions can be written using the Text User Interface (TUI), scheme commands, or actions performed through the Graphical User Interface (GUI). Essentially, a journal file records every step taken during a Fluent session, making it possible to automate the entire workflow. Once created, the journal file can be executed to run the solver and any other specified tasks automatically, ensuring consistency and efficiency in repetitive operations.
Why Create Iso-Surfaces?
Iso-surfaces are crucial in the post-processing phase of computational fluid dynamics (CFD) simulations. They represent surfaces within the computational domain where a particular scalar quantity (such as temperature, pressure, or velocity) can be obtained from every cell on a surface. Creating iso-surfaces is also essential for analyzing and visualizing a parameter in specific regions of the simulation in detail. For instance, to plot a contour of a parameter over a specific region, you need to define that region accurately using iso-surface. While this can be done manually in Ansys Fluent, the process can become tedious and time-consuming, especially when dealing with the creation of multiple surfaces, such as creating iso-surfaces along the length of a tube. Automating this task using a Fluent journal file, as demonstrated in the below video, streamlines the process significantly.
How to Create Iso-Surfaces with a Journal File
To see the detailed process of creating iso-surfaces using a Fluent journal file, watch the below video. The video provides a simple and easy-to-follow guide.
Sample of Utilized Fluent Journal File in this Tutorial
Below you can see two samples of the Ansys Fluent journal file used in the video to create iso-surfaces at various z-coordinates along a tube. These codes can make iso-surfaces within the domain and over the wall of the tube. This script automates the creation of multiple iso-surfaces, demonstrating the efficiency of this method.
For creating iso-surfaces within the domain:
surface iso-surface z-coordinate z=0.01 , , 0.010 ,
surface iso-surface z-coordinate z=0.02 , , 0.020 ,
surface iso-surface z-coordinate z=0.03 , , 0.030 ,For creating iso-surfaces over the wall of the tube:
surface iso-surface z-coordinate zw=0.97 wall, , 0.970 ,
surface iso-surface z-coordinate zw=0.98 wall, , 0.980 ,
surface iso-surface z-coordinate zw=0.99 wall, , 0.990 ,Which Method is Better?
The choice between manual and automated creation of iso-surfaces depends on the complexity and demands of your simulation. For a few surfaces, manual creation might be sufficient. However, if you need to generate many iso-surfaces, particularly in a systematic manner, utilizing a journal file is highly efficient. By using a journal file, you can efficiently create these surfaces without manually doing the procedure of creating an iso-surface in the Ansys Fluent; thus optimizing your workflow and reducing the risk of errors.
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