What is it about?
This work investigates two novel physics-based approaches to modeling the subgrid term arising from filtering the real gas equation of state for application to flows under supercritical conditions. The two approaches aim to model the underlying physics of subgrid scale processes on the unresolved term.
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Why is it important?
It is well known that liquid rocket engines operate at extremely high pressures. And in recent days, due to the requirement for higher efficiency and thrust, operating pressures of gas turbine engines and diesel engines are being pushed to higher limits. Under these conditions, the species are essentially in supercritical state. Studies have shown that using the simplified filtered equation of state for LES, could lead to significantly large errors. This work provides a way to overcome this issue and to model the unclosed term for high-fidelity LES.
Perspectives
Subgrid modeling, in literature so far, has primarily been focussed on the unclosed terms in the momentum and energy equations. For high pressure applications, using a real gas equation of state, leads to additional complexities and inadequacies with current modeling approaches. Very little work has been performed in this direction with very little success. In my opinion, this work highlights the importance of this work and provides some new paths to investigate different modeling strategies. I believe this work would lead to further research along this direction.
Umesh Unnikrishnan
Georgia Institute of Technology
Read the Original
This page is a summary of: Subgrid Scale Modeling of the Equation of State for Turbulent Flows under Supercritical Conditions, July 2017, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2017-4855.
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