•Domain Motion
–Rotating Fluid Domains
•Single Frame of Reference
•Multiple Frames of Reference
–Frame Change Models
–Pitch Change
•Mesh Defomation
•Appendix
–Moving Solid Domains
•Translation
•Rotation
•Many engineering problems
involve flows through domains which contain moving components
•Rotational motion:
–Flow though
propellers, axial turbine blades, radial pump impellers, etc.
•Translational motion:
–Train moving in
a tunnel, longitudinal sloshing of fluid in a tank, etc.
•General rigid-body motion
–Boat hulls, etc.
•Boundary deformations
–Flap valves,
flexible pipes, blood vessels, etc.
•There are several modeling
approaches for moving domains:
–For rotational
motion the equations of fluid flow can be solved in a rotating reference frame
•Additional acceleration terms are added to the momentum
equations
•Solutions become steady with respect to the rotating
reference frame
•Can couple with stationary domains through interfaces
•Some limitations apply, as discussed below
–
–Translational
motion can be solved by moving the mesh as a whole
•Interfaces can be used to allow domains to slide past each
other
–More general
rigid-body motion can be solved using a 6-DOF solver combined with mesh motion,
or the immersed solid approach
–If the domain
boundaries deform, we can solve the equations using mesh motion techniques
•Domain position and shape are functions of time
•Mesh deformed using smoothing, dynamic mesh loading or remeshing
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