Initialize the pressure field using a single scalar value

Problem

The current version of the code requires a full 3D result file to initialize the pressure field.

Providing a full 3D file just to set an initial (uniform) pressure can be cumbersome and unnecessary.

A simpler option to initialize the entire 3D domain using a single scalar value would improve usability.

For example, COMSOL provides an option to initialize the entire 3D domain with a single scalar value.

Solution

Add an option to initialize the pressure field using a single scalar value from solver.xml file. This would provide a lightweight and convenient alternative to supplying a full 3D result file when a uniform initial pressure field is sufficient.

Additional context

No response

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