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[FAQ]

Here is a list of various ways to reduce Fluent data file size 1.Switching to single precision solver from double precision will reduce the file size considerably (in some cases nearly 50% reduction in file sizes). However, this option should be used with caution as the double precision solver is intended for reducing numerical rounding errors and increasing solution accuracy. Please refer to KR #2042089 to learn more about the differences between single and double precision solvers. 2.Standard compression methods such as .gz and .h5 (known popularly as Hierarchical Data Format – HDF) can be used to save the case and data files. This can be done manually by adding .gz and .h5 extensions to the existing .cas and .dat while saving Fluent case and data files (e.g. PipeFlow.cas.gz and PipeFlow.dat.gz). Please refer to the ANSYS Fluent Users Guide for additional information on these file compression methods. 3.Ensuring only the necessary dependent variables are being written by Fluent is another way to cut-down on the overall file size. This process is controlled from ‘File -> Data File Quantities’. Standard quantities list available in this window will be saved in the data file by default and cannot be removed from the list. The user can remove unwanted variables if any additional quantities are selected. 4.Exporting .cdat files for selected surfaces and variables can also help reduce the overall file size. However, .cdat files can only be post-processed in CFD-Post. The Fluent file can be written into either Binary or ASCII file formats. Binary formats take less time to load data into CFD-Post and require less storage space. More information on .cdat can be found in ANSYS Fluent Users Guide.