Skip to main content

Glenn-HT Code


moceling graphic example from HT Code

The Glenn-HT code is a general purpose multi-block 3D Navier-Stokes solver that has been used extensively in detailed studies of heat transfer in turbomachinery.  The code comes equipped with multiple turbulence models from two-equation RANS models to LES and Time-Filtered Navier-Stokes. It can be used for both steady-state and time-accurate simulations, including multi-blade row simulations.

The multi-block capability in Glenn-HT is completely general in that there are no limitations on the connectivity between blocks (completely unstructured at the block level), which allows extremely complex geometries to be studied with computationally efficient structured grids.  In addition, non-matching grids are allowed at block boundaries, further facilitating simulations of flows in complex geometries.


The Glenn-HT code is written in Fortran 90/95, taking full advantage of Modules in modern Fortran to enable the use of object-oriented concepts such as data abstraction and encapsulation, resulting in a highly maintainable and extendible code.  The code is equipped with MPI for parallel computations and has been used on over 1000 cores. The Glenn-HT code is an exceptionally valuable tool for detailed flow simulations in complex geometries where computational efficiency of multi-block grids can make otherwise intractable flow and heat transfer simulations amenable to numerical  study.  Some of the earliest detailed simulations of tip clearance flows and multi-hole film cooling flows were done using the Glenn-HT.  Currently, researchers using Glenn-HT are breaking new ground in detailed Time-Filtered Navier-Stokes simulations involving heat transfer and multi-blade row simulations of compressor-inlet flows.

General Features 

Future Enhancements

Future enhancements to Glenn-HT could include incorporation of solution Adaptive Mesh Refinement, and higher-order accurate discretization schemes, both of which can be incorporated with relatively minor investment of time, given the flexible structure of the code.  Both these enhancements would make Glenn-HT uniquely capable of simulating details of unsteady flows in turbomachinery.

Provide feedback