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EXN/Aero Features: Many To Many & Conjugate Heat Transfer

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This article reviews the updated features list of Envenio's EXN/Aero. In this update we focus particularly on 'many to many' and conjugate heat transfer capability. While these features themselves are not ground breaking, they do make EXN/Aero's compute methodology and price structure available for more users and applications, which is an extremely positive step for CFD users across a host of industry sectors.

Many to Many

Concept: The 'many to many' factor allows connections between mesh blocks of different resolutions.  An element in one mesh block can connect to multiple elements in another mesh block and vice versa.  You end up with many faces on one side connecting to many faces on the other side; hence the name 'many to many'.  This is in contrast to our current ‘one to one’ connections where each element face connects to one and only one other element face.

What it means for our users: Most importantly, users experience less restrictions when it comes to meshing.  Requiring one to one connections can make meshing more difficult, forcing the user to add extra resolution or more mesh blocks. This level of greater flexibility means less time meshing and increased compatibility with a client’s current workflow. 

Other thoughts: Many to many is also a critical piece of infrastructure that is needed for future development, such as: rotating connections and periodic boundary conditions.

Conjugate Heat Transfer

Concept: CHT is heat transfer in both fluid and solid regions; think air flowing over a heat sink.  CHT allows us to compute both the temperature of the fluid passing over the heat sink and the temperature inside the heat sink.  Without CHT we can only solve for the fluid side temperature.  This is okay for some applications but not for others.

What it means for our users: Many internal flow and industrial processes involve heat transfer where the internal solid temperature is important. Having CHT will greatly increase the application space of EXN/Aero allowing users with these type of problems to take advantage of EXN/Aero’s GPU optimized cloud solution.

General Improvements

  • Added automatic memory scaling
  • Added table specified fluid properties
  • Added steady state compressible support
  • Added time dependent pressure outlet
  • Added automatic memory scaling
  • Added time dependent pressure outlet
  • Revamped pre-processing of mesh files on load to increase compatibility with meshers
  • Added progress bar for file load, copy and processing in EXN/View
  • General GUI improvements

Current Key Features

  • Compressible and incompressible flows
  • Energy equations
  • SST DES, SST RANS, SST k-omega
  • LES canopy
  • Porous media zones
  • Drag based porous media for canopies
  • User defined databases
  • Multifluid models for droplet transport
  • Synthetic turbulence generation for LES
  • Steady state & transients
  • Ideal gas models
  • Mixed mesh precision
  • Hybrid meshing (unstructured, structured)
  • Buoyancy driven flows
  • Graphical user interface
  • Statistics calculator
  • Passive scalar
  • Rotating frames-of-reference

Alpha Features (functional, being refined)

  • Steady state compressible flow
  • Fixed size droplet transport
  • Table specified fluid properties
  • Time dependent pressure outlet
  • Added property user tables for thermal expansion, dynamic viscosity and thermal conductivity. 
  • Six-degree of freedom (6DOF) prescribed vehicle motion
  • Free Surface modeling using the VOF method
  • Space and time parallelization (parareal)
  • LES K-subgrid
  • LES smagorinsky
  • Passive scalar
  • Syturb – synthetic turbulence
  • SEM – synthetic turbulence
  • Solution monitoring
  • Ngon general element types

Features Under Development

  • Conjugate heat transfer
  • Free surface modeling using the VOF method
  • Multicomponent fluid model
  • Many-to-many mesh connections
  • Six-degree of freedom (6DOF) coupled vehicle motion
  • Fully coupled DQMOM
  • Overset mesh
  • Moving mesh (ALE)

We have a very skilled team of developers and engineers working on getting these features launched. We also work with customers on joint development projects when there is a strong need for a particular feature. To learn more about these features, or to experience a free trial for yourself, click here.


2017-09-21 | Categories: CFD

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