Periodic Reporting for period 1 - SSeCoID (Stability and Sensitivity Methods for Flow Control and Industrial Design)
Período documentado: 2021-01-01 hasta 2022-12-31
SSECOID is facing two of the main problems present in the modern European society. On the one hand, current environmental pressure demands for more efficient, safer, affordable and environmental friendly products. This requirements create new challenges for the industry to improve the current technological designs in order to meet the expectations of the end users. On the second hand, there is a lack of skilled professionals in the field engineering, in particular in topics such as fluid mechanics, computing and aerodynamic. SSECOID will certainly contribute to overcome those problems by researching in the most advanced areas of fluid mechanics, applying this research to the pioneering and most competitive industry of the field, and by developing a specific and industry oriented training for 15 fellows in the most advances techniques of computing and fluid mechanics.
SSECOID has identified four different challenges to advance in the development of more optimized designs: Accuracy of numerical simulations, Data management, Flow stability and Flow Sensitivity, shape optimization and control.
In base of those challenges, a series of objectives are defined:
● Development of new numerical methods and tools better suited for unsteady flows.
● Identification of the features causing unsteadiness, acoustic, flow detachment or lack of performance of current aerodynamic configurations.
● Investigation of control/suppression of unsteady flow through flow control devices.
● Multidisciplinary evaluation of the most promising applications in relevant problems proposed by industry.
● Training of 15 new researchers in the development of most advanced methods for simulation, feature detection, stability and flow control techniques applied to industrial design.
● Dissemination and communication of the project´s results at international level
SSECOID has identified four different challenges to advance in the development of more optimized designs: Accuracy of numerical simulations, Data management, Flow stability and Flow Sensitivity, shape optimization and control.
In base of those challenges, a series of objectives are defined:
● Development of new numerical methods and tools better suited for unsteady flows.
● Identification of the features causing unsteadiness, acoustic, flow detachment or lack of performance of current aerodynamic configurations.
● Investigation of control/suppression of unsteady flow through flow control devices.
● Multidisciplinary evaluation of the most promising applications in relevant problems proposed by industry.
● Training of 15 new researchers in the development of most advanced methods for simulation, feature detection, stability and flow control techniques applied to industrial design.
● Dissemination and communication of the project´s results at international level
Activities in SSECOID are structured in base of 4 technical work-packages
WP1: Industrial designs and flow control strategies
WP2: High accuracy numerical simulations and data management
WP3: Flow stability and adjoint
WP3: Flow sensitivity and control.
In WP1, a series of problems of industrial relevance has been proposed.
TC1: Full formula 1 configuration with detailed analysis of the front wing.
TC2: Isolated supersonic turbine.
TC3: Shape optimization of an inkjet printhead.
TC4: Turbulent transition under roughness surfaces elements
TC5: Analyzing aerodynamically and acoustically induced vibrations in the wake of a bluff body, including final acoustic radiation.
In WP2, we are working in the industrialization of the most advances numerical methods and its application to the proposed test cases to identify their strengths and weaknesses. ESR1 has implemented an Immersed boundary method for handling complex geometries. ESR4 has redesigned the a-priori 2D and 3D high-order mesh generation techniques with a focus on mesh quality and accuracy. ESR5 has implemented 2D, 2.5D and 3D implicit high-order schemes for Low-Speed Industrial Flows in Nektar++ achieving a significant time step increase for canonical problems. ESR11 has finished the h/p-multigrid development and has performed multiple high-order simulations on automotive geometries. ESR12/13 have performed major testing and profiling campaigns for highly detached unsteady simulations for TC1 geometries, achieving the current optimal computational performance of the Nektar++ solver. Finally, ESR12 has focused on time sub-stepping techniques and ESR13 is investigating multi-grid preconditioners from different libraries.
WP3 aims to develop numerical tools for stability and receptivity analysis of two- (2D) and three-dimensional (3D) laminar and turbulent 3D complex flows. ESR2 studies the laminar flow separation on low-pressure turbines (LPT) with high-order solvers. ESR7 is focused on the onset of flow unsteadiness and flutter by using very accurate numerical simulation and stability analysis. ESR8 is studying the instabilities of turbulent detached flows, encountered in airfoils and wings at high Reynolds numbers and high angles of attacks. The aim of ESR9 is to study the effect of surface irregularities on laminar turbulent transition, which is focused on the implementation of the effect of the surface irregularities in the current linear stability tools and study fully 3D boundary layers, a similar research line of ESR10, computing DNS solutions for 3D boundary layer flow that can allow the study of the effects that discrete surface irregularities have on the transition from laminar to turbulent flow.
Finally, WP4 aims to develop tools to obtain the sensitivity and receptivity of complex flows and their unsteady modes under external perturbations. ESR6 has extended the implementation and solution of the thermos-viscous acoustic equations to a three-dimensional geometry that closely resembles an industrial inkjet printhead of TC3, and he has used this direct/adjoint code to generate the optimal boundary condition for the control of reverberations in the inkjet printhead channel. ESR14 has been working in a FEM to capture the structural modes and resonance frequencies of TC5 test case, as a second step, control methodologies aiming to reduce the acoustic structural coupling will be investigated. ESR15 is focuses on surface waviness as a mean to control transition. However, one of the consequences of surface waviness is flow separation, for these reason, ESR15 is studying the global stability of separation bubbles due to surface waviness and the way to control the detachment.
WP1: Industrial designs and flow control strategies
WP2: High accuracy numerical simulations and data management
WP3: Flow stability and adjoint
WP3: Flow sensitivity and control.
In WP1, a series of problems of industrial relevance has been proposed.
TC1: Full formula 1 configuration with detailed analysis of the front wing.
TC2: Isolated supersonic turbine.
TC3: Shape optimization of an inkjet printhead.
TC4: Turbulent transition under roughness surfaces elements
TC5: Analyzing aerodynamically and acoustically induced vibrations in the wake of a bluff body, including final acoustic radiation.
In WP2, we are working in the industrialization of the most advances numerical methods and its application to the proposed test cases to identify their strengths and weaknesses. ESR1 has implemented an Immersed boundary method for handling complex geometries. ESR4 has redesigned the a-priori 2D and 3D high-order mesh generation techniques with a focus on mesh quality and accuracy. ESR5 has implemented 2D, 2.5D and 3D implicit high-order schemes for Low-Speed Industrial Flows in Nektar++ achieving a significant time step increase for canonical problems. ESR11 has finished the h/p-multigrid development and has performed multiple high-order simulations on automotive geometries. ESR12/13 have performed major testing and profiling campaigns for highly detached unsteady simulations for TC1 geometries, achieving the current optimal computational performance of the Nektar++ solver. Finally, ESR12 has focused on time sub-stepping techniques and ESR13 is investigating multi-grid preconditioners from different libraries.
WP3 aims to develop numerical tools for stability and receptivity analysis of two- (2D) and three-dimensional (3D) laminar and turbulent 3D complex flows. ESR2 studies the laminar flow separation on low-pressure turbines (LPT) with high-order solvers. ESR7 is focused on the onset of flow unsteadiness and flutter by using very accurate numerical simulation and stability analysis. ESR8 is studying the instabilities of turbulent detached flows, encountered in airfoils and wings at high Reynolds numbers and high angles of attacks. The aim of ESR9 is to study the effect of surface irregularities on laminar turbulent transition, which is focused on the implementation of the effect of the surface irregularities in the current linear stability tools and study fully 3D boundary layers, a similar research line of ESR10, computing DNS solutions for 3D boundary layer flow that can allow the study of the effects that discrete surface irregularities have on the transition from laminar to turbulent flow.
Finally, WP4 aims to develop tools to obtain the sensitivity and receptivity of complex flows and their unsteady modes under external perturbations. ESR6 has extended the implementation and solution of the thermos-viscous acoustic equations to a three-dimensional geometry that closely resembles an industrial inkjet printhead of TC3, and he has used this direct/adjoint code to generate the optimal boundary condition for the control of reverberations in the inkjet printhead channel. ESR14 has been working in a FEM to capture the structural modes and resonance frequencies of TC5 test case, as a second step, control methodologies aiming to reduce the acoustic structural coupling will be investigated. ESR15 is focuses on surface waviness as a mean to control transition. However, one of the consequences of surface waviness is flow separation, for these reason, ESR15 is studying the global stability of separation bubbles due to surface waviness and the way to control the detachment.
In numerical simulation tools, SSECOID is advancing in the industrialization of High Order methods able to run at an acceptable computational costs (overnight) complex 3D industrial configurations with large detached areas and robust turbulence models, including error estimation in the numerical solutions, h- (mesh refinement), r- (moving mesh), or p- (polynomial) adaptation, flexible implementation of boundary conditions such as non-reflecting for multidimensional aeroacoustics problems, efficient iterative schemes, parallelization techniques, data analysis (through mode decomposition algorithms).
In understanding flow physics, SSECOID is applying stability and adjoint methods to study of high-speed flows, high Reynolds numbers, flow separation and laminar turbulent transition in three dimensional geometries in unsteady condition.
In flow control, SSECOID is developed new methods and tools able to provide information about where and when is more efficient to apply flow control, by developing new methods to obtain sensitivity maps of unstable features (discovered by stability analysis or mode decomposition) under the effect of design variables or external influence, such as noise, surface/shape deformation or surface irregularities, and to extend this information to control flow features on industrial problems.
Overall, the development and industrialization of these advances will have a decisive impact on future designs, in particular, in the transition to electric and hydrogen based aircraft. New configurations must be studied and evaluate, having a strong economical impact on the competitiveness of the European industry and environmental impact in the design of more environmental friendly configurations.
In understanding flow physics, SSECOID is applying stability and adjoint methods to study of high-speed flows, high Reynolds numbers, flow separation and laminar turbulent transition in three dimensional geometries in unsteady condition.
In flow control, SSECOID is developed new methods and tools able to provide information about where and when is more efficient to apply flow control, by developing new methods to obtain sensitivity maps of unstable features (discovered by stability analysis or mode decomposition) under the effect of design variables or external influence, such as noise, surface/shape deformation or surface irregularities, and to extend this information to control flow features on industrial problems.
Overall, the development and industrialization of these advances will have a decisive impact on future designs, in particular, in the transition to electric and hydrogen based aircraft. New configurations must be studied and evaluate, having a strong economical impact on the competitiveness of the European industry and environmental impact in the design of more environmental friendly configurations.