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Thinking in components
- general fluid domain
Each component can be designed separately and afterwards connected together to build the whole machine geometry.
Suppose the following water pump geometry:
For CFD purposes, this pump must be disassembled into at least two parts: impeller and volute. Looking at the machine in more detail, we can disassembled it into four parts: inlet pipe, impeller, volute and outlet pipe.
The rotor component must have a rotational symmetry. Therefore, it would be possible to define the inlet pipe and the impeller as one component. But a more sensible option is to split it into two parts. The same treatment can be applied to the volute and the outlet pipe. It can be defined as one component or split into two components.
Whole component geometry
INPUT RULE 3: Split your geometry into reasonable amount of components having at least one rotor part with rotational symmetry.