The Variation Method and Value for each component is entered separately, but it is recommended that the same variation be used for all three components.
Creating Resistance Materials is similar to creating fluid and solid materials:
The Default material database contains at least one instance of every material type. A convenient way to create a new material is to use a Default material as an example. Because these materials are read-only, use the Material Editor to copy the original into a custom database, and modify the copy. For more about creating a material from an existing material...
Example showing creation of a distributed resistance material
A Resistance material definition does not reference specific Cartesian components. Instead, the values are saved as the Through-Flow, and the two Normal Components. The specific Cartesian orientation of the material is specified when a resistance material is applied to a part.
A thermal conductivity can also be assigned to a resistance material. This can be different from the surrounding fluid, and is important for heat transfer analyses in which the material will play a thermal role.
No other fluid property information is required to define a resistance. The Solver automatically applies the fluid property information from the surrounding fluid to the resistance. For this reason it is very important that a resistance region only contact one fluid material type. If, for example, a resistance contacts air on one side and water on the other, an error will result, and the analysis will not run.