One of the main challenges for industrial CFD codes such as CODA is to make achievable computations in meaningful configurations (such as the in-flight conditions for an aircraft) being robust and the most accurate as possible. One of the main objectives of the NextSim project is to design and develop accurate and efficient numerical methods, and to further push the limits of the most cutting edge of technologies.
After one year, very interesting results have been reached.
⦁ High fidelity simulations of aircraft configurations have been made possible by the implementation of the DGSEM discretization and of the ZDES turbulence model. The efficient implementation of the DGSEM method in an industrial solver is an important achievement in order to explore new ways to improve the accuracy of the simulations of high lift configurations.
⦁ New turbulence and wall models have been explored in order to improve the prediction of the friction drag, a quantity of huge importance for the design of aerodynamic bodies. This achievement confirm the flexibility of CODA software that can be used either for pure research purpose either for more industrial tasks.
⦁ The Volume Penalization IB, which can deal with immersed bodies in a Cartesian mesh, has been successfully implemented. This would allow the simulation of moving bodies (such as the flaps at the trailing edge of a wing) and hence to improve the accuracy of unsteady simulations for high lift configurations.
⦁ In order to improve the convergence time of steady simulations, a preliminary prototype of linear multigrid has been implemented and tested with very promising results in 2D configurations (see below the convergence history). This result has been achieved thanks to the joint effort of implementing an efficient MG algorithm and a new, efficient, non-structured agglomerator (CoMMA)
Some other results, notably more complex configurations with IB methods and transition modelling, are yet to come, so stay tuned !