Sökning: "geometrical models"

Visar resultat 21 - 25 av 194 avhandlingar innehållade orden geometrical models.

  1. 21. Significane of loss models in aerothermodynamic simulation for axial turbines

    Författare :Ning Wei; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis deals with a study of the significance of lossmodels and their applications in simulation and optimisation ofaxial turbines. The design of a turbomachine system is a verycomplex engineering operation which can be looked upon as aniterative procedure made of various steps. LÄS MER

  3. 22. Application of Differential Geometry to Elasticity and Corresponding Discrete Models

    Författare :Nina Lautersztajn-S.; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mechanical systems; differential geometry; isoparametric four-node elements; Lie groups; non-linear elasticity; elasticity; finite element method;

    Sammanfattning : The amazing development in technology and industry during the last half of the twentieth century has opened totally new research fields. One of them is computational mechanics. Suddenly very complex, three-dimensional nonlinear engineering problems could be solved as a consequence of explosive advances in computers and numerical schemes. LÄS MER

  4. 23. Simulation and Optimization of an Axial Compressor Considering Tip Clearance Flow

    Författare :Marcus Lejon; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; design; compressor; optimization; validation; CFD; turbulence models; tip clearance;

    Sammanfattning : With ever-increasing demands for high efficiency in axial compressors, it has become important to consider more geometrical features of the manufactured component in the design phase. Many possibilities open if the level of fidelity of the computational model can be increased. LÄS MER

  5. 24. Uncertainty quantification for time varying quantities in turbulent flows

    Författare :Donnatella Xavier; Philipp Schlatter; Saleh Rezaeiravesh; Ricardo Vinuesa; David Moxey; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; uncertainty; variance estimator; autoregressive models; turbulence; computational fluid dynamics; Teknisk mekanik; Engineering Mechanics;

    Sammanfattning : Quantification of uncertainty in results is crucial in both experiments and simulations of turbulence, yet this practice is notably underutilized. This thesis project delves into statistical tools within the framework of uncertainty quantification to systematically quantify uncertainties that occur in the time varying quantities of turbulence. LÄS MER

  7. 25. Towards the Inclusion of Pelvis Population Variance in Human Body Models

    Författare :Erik Brynskog; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Finite Element Human Body Model; Sparse Principal Component Analysis; Global Sensitivity Analysis; Pelvis; Population Variance;

    Sammanfattning : With a future large-scale introduction of autonomous vehicles, the proportion of intersection crashes on the total number of motor vehicle crashes is expected to increase. The pelvis is frequently exposed to high loads in several of these impacts. LÄS MER