Hello, for coloring the created iso-surface, click on new Mesh object under the Results Tab, then, under Surfaces select the already created Iso-surface. Once done, you can set color of this mesh object by using Uniform option. For line surface, create another mesh object by going to the Results Tab, then select only the created line surface under Surfaces. After this, you can create new Scene using the Outline Tab. Make sure to select both the mesh objects and set desired transparency for proper visualization.
To know more about the various commonly used results post-processing elements in Ansys Fluent, please have a look at this Ansys Innovation Course on Post Processing in Ansys Fluent whose link is given below.
Post Processing in Ansys Fluent | Ansys Innovation Courses
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