The procedure to define the porosity value as an input parameter using ANSYS Fluent TUI is outlined below 1. Enable the use of parameters in TUI by using the command below /define/parameters/enable-in-TUI? yes 2. In the TUI, type /define/boundary-conditions/set/fluid 3. Select the appropriate cell-zone by typing its name and hitting the Enter key. At this point, you might be prompted to enter the name of another cell-zone as well, just hit the Enter key without giving any input. 4. You will then be prompted with a “Setting to change (use “info” for descriptions)” option. Here, type “porosity” (without any quotes). For other options, just hit Enter without any input and a list of variables that can be set will be displayed. 5. After typing porosity and hitting the enter key, you will be prompted with a “Use Input Parameter for Porosity?” option. Type yes and hit Enter. 6. You will then be prompted to Enter the name of the parameter or Use Existing Parameter. Select the appropriate action and set the value for the parameter. Keywords: Porosity; Parameter; TUI; Fluent