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NEWT

CAD IMPORT (3DGEO)

Imports CAD data containing parametric edges and faces information. Handles native CAD/IGES/STEP geometry and provides an editing and repair system.

A view of surface mesh and IGES data import

CAD REPAIR (3DGEO)

Removes duplicate edges and faces and unused nodes and edges in the data file. Creates automatic topology by automatically identifying all the edges around the faces.

Changing the design of the cooling passage using 3D Geo Editor. The control points on the cooling passage may be edited through the pop-up dialog or dragging the points using left mouse button.

A view of all the surfaces of a turbo charger and FALCON.

SURFACE MESHER (SRFMSH)

Generates surface triangles on any arbitrary 3D geometry using a Delaunay triangulation algorithm. Features automatic refinement for curvature, proximity etc. The following parameters are very easily controlled - size of the triangles, viscous layers, curvature and 2D to 3D extrusion.

Surface mesh around the trailing edge of a turbomechinery blade

Surface triangularisation for Falcon geometry

Extruded surface mesh, turbine leading edge film cooling

TETRAHEDRAL MESHER (VOLMSH)

Produces a 3D Delaunay tetrahedralisation of the domain. This process also includes optimisation of the quality of the cells. Full 3D Delaunay volume mesher, highly stretched viscous tets near walls together with options for modular meshing.

Volume mesh with viscous layers on a Stator/Shroud geometry

FLOW SOLVER (NEWT & HYDRA)

The mesh, its connectivity and an initial guess are written out for NEWT solver system or filtered through JM52 to the Rolls Royce HYDRA system.

Nacelle in cross-flow developing fan inlet distortion

The NEWT solver features:

• 3D unstructured, cell-vertex, full 2nd order time-space, NS solver;
• solution adaption, moving body & forced/coupled response capability;
• low Re k-? & Smagorinsky LES modelling;
• uses METiS to perform domain decomposition/load balancing
• parallelised using MPI for Hitachi, SGI Origin, IBM SP and PC clusters
• ported to national CSAR T3E & HPCx facilities in collaboration with HPCx Support
• about 80% efficiency across all platforms to 64 processors
• Visual 3 & FIELDVIEW post processing with PV3 & FIELDVIEW options for parallel visualisation and PTC Division Mockup for VR

Further information

See also the NEWT pages at the CFD Laboratory, Cambridge University Engineering Department, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom.

• W.N. Dawes, P.C. Dhanasekaran, A.A.J. Demargne, W.P. Kellar & A.M. Savill
  Reducing bottlenecks in the CAD-to-mesh-to-solution cycle time to allow CFD to participate in design
  ASME Gas Turbine Conference, 2000
• Birkby, P., Cant, R.S., Dawes, W.N., Demargne, A.A.J., Dhanasekaran, P.C., Kellar, W.P., Rycroft, N.C., Savill, A.M., Eggels, R.L.G.M., Jennions, I.K.
  CFD Analysis of a complete industrial lean pre-mixed gas turbine combustor
  ASME Gas Turbine Conference 2000
• Dawes, W.N.,
  Simulating Unsteady Turbomachinery Flows on Unstructured Meshes which Adapt both in Time and Space
  ASME Paper 93-GT-104, 1993.
• Dawes, W.N.,
  The generation of 3D stretched, viscous unstructured meshes for arbitrary domains
  ASME Paper 96-GT-55, 1996
• Dawes, W.N.,
  The Practical Application of Solution Adaption to the Numerical Simulation of Complex Turbomachinery Problems
  Progress in Aerospace Sciences, vol.29, pp221-269, 1992.
• Dawes, W.N., Dhanasekaran, P.C. & Demargne, A.A.J., 1999
  NEWT_mesh mesh generation system
  http://www2.eng.cam.ac.uk/~mea/fluid/dawes/newt_mesh2/newt_mesh2.htm
• Kellar, W.P., Savill, A.M. & Dawes, W.N.
  Integrated CAD/CFD Visualisation of a Generic F1 Car Front Wheel Flowfield
  Lecture Notes in Computer Science, Vol 1593, 1999.
• Kellar, W.P.,
  Geometry Modelling in CFD
  CUED/CFD Lab Report, 1999.
• Rycroft, N., Savill, A.M., Dawes, W.N.,
  The Parallelisation of an Unstructured Mesh CFD Code
  CUED Report, Cambridge University Engineering Department, 1999.