CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

adjointShapeOptimizationFoam

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   August 9, 2012, 11:23
Default adjointShapeOptimizationFoam
  #1
New Member
 
Thomas Clark
Join Date: Mar 2009
Location: Cambridge, UK
Posts: 10
Rep Power: 9
t_clark is on a distinguished road
Hi all,

I'd like some perspectives on set-up of an optimisation problem using adjointShapeOptimisationFoam.

I have a turbine (extracting power from the flow) in a duct. I'm interested in optimising the duct to extract maximum power (for a given overall size) - so can represent the rotor with a momentum sink or porous zone at this stage (no need for MRF complexity).

The power varies with the mass flow through the rotor zone, and with pressure drop across that zone (Power = Force.Velocity).

However, the mass flow and the pressure drop are related; for a given duct geometry, mass flow decreases as pressure drop (thrust on the turbine) increases. There is therefore an optimal pressure drop for a given geometry.

Conversely, for a given pressure drop one should be able to maximise mass flow (therefore power) by changing the geometry.

The latter is what I'd like to do. So, the question(s) is(are):

1. Can I set up a cylindrical volume with a constant porosity, surrounded by the variable-porosity region used in adjointSOF?

2. Or, should I set up the inlet to my rotor region as an outlet (and the outlet of rotor as inlet to the main volume) and couple them together with a pressure drop to represent the rotor?

In 1. or 2. I'd then optimise mass flow to maximise power, but I'd have to do several optimisations for a range of pressure drops. So...

3. How trivial is it to maximise power take-off instead of mass flow? A matter of modifying the solver a bit, or a matter of completely rewriting the equation set?

Any perspectives or alternative approaches are very welcome.

Best regards

Tom Clark
t_clark is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 21:16.