During the Project the two Russian groups (Institute for Problems in Mechanics & Scientific Research Centre Ecolen, Moscow) have been evaluating a range of further turbulence model approaches against SIGtest case data provided by researchers at Cambridge University who coordinate both the INTAS Project and the ECOFTAC SIG as a whole.
The IPM researchers have independently verified a number of conclusion drawn by the SIG regarding the relative merits of different two-equation transport models, and more importantly have indicated an unconsidered model may offer the best option for extending predictions tovery low free-stream turbulence levels encountered in external flows, as well as extensing computations tobalding and unsteady boundary layer flows.
The Ecolen researchers have been improving and re-evaluating their one-equation eddy-viscosity transport which the SIG had already identified as the best prediction methodin its class. Both groups have proposed modifications at the one and two equation level of model closure particularly for considering turbine blade heat transfer effects and have introduced to the project previously unavailable data for these.
A third, Ukrainian group (Institute of Engineering Thermophysics, Kiev) have established a new series of heat transfer test cases for the SIG including a baseline case equivalent to one of the initial SIG entry test cases, without heat transfer, which has been made available to all SIG participants. Computations by Ecolen & IPM have revealed a need for additional heat transfer model refinements. The vt-92 model has been further modified to better predict such heat transfer effects, comparison has been made with data from an established international test case and new experiments not previously published outside Russia, as well as the test case provided by participant 3.
