Types of flows and geometries
 
 
-- stationary/instationary (ik zou zeggen: steady / unsteady)
 
We perform both steady and unsteady flow calculations.
 
-- 2D/3D
 
Both 2D and 3D problems are investigated
 
-- laminar/turbulent
 
Although some problems are typically in the laminar regime we mainly treat
problems that exhbit fully turbulent flow.
 
-- compressible, in-compressible
 
Both compressible and incompressible
 
-- turbulent: models
              k-e
              RNG k-e
              Re stress
              k-w
              wall laws: standard, enhanced
              
Depending on the problem all models are used where appropiate. The k-e model
generally produces questionable results and is therefore mostly discarded.
 
-- separation
 
The problem of flow separation is very important for our analyses. Hence
this phenomenon is always taken into account.
 
-- complicated geometries:
   -- complicated physics
 
enerally no complicated physics involved
 
   -- complicated grid
      -- 2D
      -- 3D
   
2D & 3D
 
   -- how complicated
      number of objects
      number of grid points
 
Typical number of gridpoints for our probems : 500,000 to 1,000,000.
Sometimes: 3,000,000 when details of the 3D boundary layer are required
 
      examples
      
-- geometry outline:
   -- gambit
   -- ProEngineer
   -- other
   
We use Gambit as the main grid generator. Sometimes the surface modeler
"Rhinoceros" is used as preprocessor (complex surface generator) for Gambit.
Interfacing through ICES-formatted files.
 
-- grids
   -- gambit
   -- ICEM
   -- other
 
physics:
   -- multi-phase
      -- two-phase
             fluid-particle
             fluid-bubble
             lagrangian
             eulerian (multiple-fluid)
             VOF
             
No multi-phase flow
 
  -- heat transfer
     -- passive (shear driven)
     -- active (buoyancy induced)
 
Seldom
 
  -- combustion
     -- pre-mixed
     -- non-pre-mixed
     -- other
     
Seldom
 
  -- other physics
     -- MHD
     -- 
              
-- parallel
   experience: speed up?
               ease of use?
 
We have performed some parallel calculations and as far as we can see this
works fine in Fluent. However most problems are solved on single processer
Desktop PC's.
 
-- specific geometries/flows/techniques
   -- ventilation
   -- cooling
   -- phase-transition
   -- LES
   -- flow around bluff bodies
   -- flow around streamlined bodies
   
The problems that we treat are in the area of aerospace and vehicle
aerodynamics. Hence 80% of the problems concern external flow around bodies
(wings, fuselages, complete aircraft, cars, propellers,etc.)
 
-- typical examples of geometries
-- typical geometries that you do NOT with Fluent
   -- there are much-easier other packages
   -- Fluent cannot do it at all
 
Typical problems treated sofar:
 
   -- 2D flow around airfoils, incompressible
   -- ground vehicles (cars)
   -- wings
   -- propeller-wing model (interaction problem)
   -- flow in/over cavities (low Re-number)
   -- synthetic jets (zero-mass transfer)
   -- bluff bodies (leading and trailing edge flow)
   
 
   
 
_____________________________________
Delft University of Technology  (www.tudelft.nl)
Fac. of Aerospace Engineering (www.lr.tudelft.nl)
Aerodynamics Group
Kluyverweg 1
2629 HS Delft, the Netherlands
tel. +31 15 2782009
fax. +31 15 2787077