Computational Biofluid , Aero and Thermal Dynamics
This project includes three different sub-areas (BIOFLUID, AERO and THERMAL) within Computational Mechanics and Engineering. In each of the sub-areas we utilize a combination of scale-resolved fluid dynamics simulations symbiotically combined with high resolution experimental measurements. BIOFLUID DYNAMICS concerns patient specific models of cardiovascular flow (heart as well as blood vessels). Apart from an increased understanding of the normal and abnormal blood flow in the human body we target intervention planning as well as follow-up and diagnostic aid for different reconstruction procedures. In order to establish such capability, a thorough understanding of normal flow conditions is required. We utilize the basic principles of fluid dynamics as well as the modelling and simulation capabilities from computational engineering and high performance computing in combination with modern imaging modalities and image processing. Specific research questions: Validation of CFD-CT vs MRI (simulation vs measurement), Validation of atlas-based automatic meshing for clinical quality vascular simulations, Uncertainty quantification of flow inlet to heart model, Detailed analysis of turbulent flow and Reynolds stresses. AERODYNAMICS investigates and enhance the aerodynamic performance of the complete high capacity transport vehicles by improving the aerodynamic efficiency of swap bodies, trailers and other parts added to the truck by separate manufactures. The design and understanding of flow features go hand in hand with the development of simulation strategies suited for optimization as well as new turbulence models. Specific research questions: validation of LES and other scale-resolving techniques for simulation of simplified geometries vs water tunnel data, simulation of full scale timber vehicle and validation against wind tunnel data, investigation of yaw angle dependence on full vehicle (empty and loaded), effects of atmospheric boundary layer as well as different weather conditions as well as stake optimization. In THERMAL DYNAMICS we investigate efficient film cooling for the thermal protection of gas turbine engines and to attain high turbine firing temperature which can lead to improved efficiency and longer life span for the parts. Heat load analysis of the turbine stator and rotor blades play an important role in the estimation of the life time of hot gas components life. The strong flow unsteadiness and mixing effects from stator-rotor blade interactions and cooling injections call for time accurate numerical simulations which are computationally expensive. We focus on efficient strategies for simulation combined with investigations of turbulence models that are applicable for predictive usage as well as optimization. Specific research questions: Detailed flow simulation strategies for film cooling flow including both DES/SAS-type and LES, simulation of orifice flow and validation against experimental data for enhanced predictability and further development of simulation based correlations, LES-type simulation of ribbed ducts as well as pipe flows for increased heat transfer in low/high Reynolds number flow regime as well as temperature attenuation in a two-stage turbine.