The Experts below are selected from a list of 1638 Experts worldwide ranked by ideXlab platform

F. Stern - One of the best experts on this subject based on the ideXlab platform.

  • Forces, moment and wave pattern for surface combatant in regular head wavesPart II. Measurement results and discussions
    Experiments in Fluids, 2002
    Co-Authors: L. Gui, J. Longo, B. Metcalf, J. Shao, F. Stern
    Abstract:

    Unsteady resistance, Heave Force, pitch moment and free-surface elevations for DTMB 5512 at steady forward speed and in regular head waves are investigated with different measurement systems for a fairly wide range of test conditions in the IIHR towing tank. Test data are procured for validation of Reynolds-averaged Navier–Stokes computational fluid dynamics codes and for understanding the physics of unsteady ship hydrodynamics. The second part of the paper presents the measurement results and discussions.

  • Forces, moment, and wave pattern for surface combatant in regular head waves Part I. Measurement systems and uncertainty assessment
    Experiments in Fluids, 2001
    Co-Authors: L. Gui, J. Longo, B. Metcalf, J. Shao, F. Stern
    Abstract:

    A model-scale naval surface combatant, DTMB 5512, is studied experimentally in steady forward speed and regular head waves with the Iowa Institute of Hydraulic Research towing-tank facilities. Unsteady resistance, Heave Force, pitch moment and free-surface elevations are investigated with different measurement systems for a fairly wide range of test conditions. Test data is procured for validation of RANS computational fluid dynamics codes and for understanding the physics of unsteady ship hydrodynamics. In the first part of the two-part paper, details of data reductions, measurement systems and uncertainty assessment procedures are provided.

  • Forces, moment, and wave pattern for surface combatant in regular head waves Part I. Measurement systems and uncertainty assessment
    Experiments in Fluids, 2001
    Co-Authors: L. Gui, J. Longo, B. Metcalf, J. Shao, F. Stern
    Abstract:

    A model-scale naval surface combatant, DTMB 5512, is studied experimentally in steady forward speed and regular head waves with the Iowa Institute of Hydraulic Research towing-tank facilities. Unsteady resistance, Heave Force, pitch moment and free-surface elevations are investigated with different measurement systems for a fairly wide range of test conditions. Test data is procured for validation of RANS computational fluid dynamics codes and for understanding the physics of unsteady ship hydrodynamics. In the first part of the two-part paper, details of data reductions, measurement systems and uncertainty assessment procedures are provided.

  • Forces, Moment and Wave Pattern for Naval Combatant in Regular Head Waves
    2001
    Co-Authors: L. Gui, J. Longo, J. Shao, B Metcalfe, F. Stern
    Abstract:

    A model-scale naval surface combatant, DTMB 5512, is studied experimentally in steady forward speed and regular head waves with the Iowa Institute of Hydraulic Research (IIHR) towing tank facilities. Unsteady resistance, Heave Force, pitch moment and free-surface elevations are investigated with different measurement systems for a fairly wide range of test conditions. Test data are procured for validation of Reynolds Averaged Navier-Stokes (RANS) computational fliud dynamics (CFD) codes and for understanding the physics of unsteady ship hydrodynamics. Uncertainty assessments are completed following the AIAA Standard. The results and discussions for the Forces and moment cover the time mean values, added resistance and linear and non-linear responses. Results of free surface elevation tests include reconstructed unsteady wave patterns, diffraction wave patterns, and free surface turbulence distributions.

Yupeng Shen - One of the best experts on this subject based on the ideXlab platform.

  • Study on Preliminary Design of the Transmission Towers’ Foundation in Arctic Permafrost Region
    DEStech Transactions on Computer Science and Engineering, 2017
    Co-Authors: Yongfeng Chen, Zhaoqing Zhu, Shijun Ding, Yupeng Shen
    Abstract:

    The design and construction of the foundation of transmission towers in permafrost regions is influenced by permafrost soil. Many characteristics of permafrost threaten the construction and safe operation of the transmission line engineering. These characteristics include frost Heave, thaw settlement, and frost lifting, all of which have been aggravated by global warming and permafrost degradation. The principle applied in calculating the frost-Heave Force of the line tower foundation in permafrost regions is analyzed in this study based on the climate of both arctic and permafrost regions and on the characteristics of permafrost. The commonly used foundation types and the working conditions suitable for such types are also summarized.

L. Gui - One of the best experts on this subject based on the ideXlab platform.

  • Forces, moment and wave pattern for surface combatant in regular head wavesPart II. Measurement results and discussions
    Experiments in Fluids, 2002
    Co-Authors: L. Gui, J. Longo, B. Metcalf, J. Shao, F. Stern
    Abstract:

    Unsteady resistance, Heave Force, pitch moment and free-surface elevations for DTMB 5512 at steady forward speed and in regular head waves are investigated with different measurement systems for a fairly wide range of test conditions in the IIHR towing tank. Test data are procured for validation of Reynolds-averaged Navier–Stokes computational fluid dynamics codes and for understanding the physics of unsteady ship hydrodynamics. The second part of the paper presents the measurement results and discussions.

  • Forces, moment, and wave pattern for surface combatant in regular head waves Part I. Measurement systems and uncertainty assessment
    Experiments in Fluids, 2001
    Co-Authors: L. Gui, J. Longo, B. Metcalf, J. Shao, F. Stern
    Abstract:

    A model-scale naval surface combatant, DTMB 5512, is studied experimentally in steady forward speed and regular head waves with the Iowa Institute of Hydraulic Research towing-tank facilities. Unsteady resistance, Heave Force, pitch moment and free-surface elevations are investigated with different measurement systems for a fairly wide range of test conditions. Test data is procured for validation of RANS computational fluid dynamics codes and for understanding the physics of unsteady ship hydrodynamics. In the first part of the two-part paper, details of data reductions, measurement systems and uncertainty assessment procedures are provided.

  • Forces, moment, and wave pattern for surface combatant in regular head waves Part I. Measurement systems and uncertainty assessment
    Experiments in Fluids, 2001
    Co-Authors: L. Gui, J. Longo, B. Metcalf, J. Shao, F. Stern
    Abstract:

    A model-scale naval surface combatant, DTMB 5512, is studied experimentally in steady forward speed and regular head waves with the Iowa Institute of Hydraulic Research towing-tank facilities. Unsteady resistance, Heave Force, pitch moment and free-surface elevations are investigated with different measurement systems for a fairly wide range of test conditions. Test data is procured for validation of RANS computational fluid dynamics codes and for understanding the physics of unsteady ship hydrodynamics. In the first part of the two-part paper, details of data reductions, measurement systems and uncertainty assessment procedures are provided.

  • Forces, Moment and Wave Pattern for Naval Combatant in Regular Head Waves
    2001
    Co-Authors: L. Gui, J. Longo, J. Shao, B Metcalfe, F. Stern
    Abstract:

    A model-scale naval surface combatant, DTMB 5512, is studied experimentally in steady forward speed and regular head waves with the Iowa Institute of Hydraulic Research (IIHR) towing tank facilities. Unsteady resistance, Heave Force, pitch moment and free-surface elevations are investigated with different measurement systems for a fairly wide range of test conditions. Test data are procured for validation of Reynolds Averaged Navier-Stokes (RANS) computational fliud dynamics (CFD) codes and for understanding the physics of unsteady ship hydrodynamics. Uncertainty assessments are completed following the AIAA Standard. The results and discussions for the Forces and moment cover the time mean values, added resistance and linear and non-linear responses. Results of free surface elevation tests include reconstructed unsteady wave patterns, diffraction wave patterns, and free surface turbulence distributions.

Yongfeng Chen - One of the best experts on this subject based on the ideXlab platform.

  • Study on Preliminary Design of the Transmission Towers’ Foundation in Arctic Permafrost Region
    DEStech Transactions on Computer Science and Engineering, 2017
    Co-Authors: Yongfeng Chen, Zhaoqing Zhu, Shijun Ding, Yupeng Shen
    Abstract:

    The design and construction of the foundation of transmission towers in permafrost regions is influenced by permafrost soil. Many characteristics of permafrost threaten the construction and safe operation of the transmission line engineering. These characteristics include frost Heave, thaw settlement, and frost lifting, all of which have been aggravated by global warming and permafrost degradation. The principle applied in calculating the frost-Heave Force of the line tower foundation in permafrost regions is analyzed in this study based on the climate of both arctic and permafrost regions and on the characteristics of permafrost. The commonly used foundation types and the working conditions suitable for such types are also summarized.

Eatock R Taylor - One of the best experts on this subject based on the ideXlab platform.

  • semi analytical solution for second order wave diffraction by a truncated circular cylinder in monochromatic waves
    Journal of Fluid Mechanics, 1996
    Co-Authors: J B Huang, Eatock R Taylor
    Abstract:

    A complete semi-analytical solution is given for second-order diffraction of monochromatic waves by a truncated vertical circular cylinder in water of uniform finite depth. The methodology presented in detail elsewhere (Eatock Taylor & Huang 1996) is adopted to find a particular solution which exactly satisfies the governing equation, the inhomogeneous free-surface condition and the seabed condition. In order to satisfy the boundary condition on the cylinder bottom, the fluid domain around the cylinder is divided into two regions. First- and second-order velocity potentials are described separately in the two regions and matched on the interface by the pressure and normal-velocity continuity conditions. Based on the formulation, the second-order wave field in the vicinity of the cylinder and the corresponding wave Forces and overturning moments on the cylinder are studied in detail. Numerical results for the double frequency Forces obtained by using the present semi-analytical approach are compared with those computed with a higher-order boundary element method (Eatock Taylor & Chau 1992). As well as the exact solution, an approximate solution is also given for the second-order potential and the corresponding Forces. Numerical results show that the approximate solution possesses excellent accuracy for the total second-order Heave Force over a wide range of conditions. When kb > 1.2 (where k, b are the incident wavenumber and the draught of the cylinder respectively), the accuracy for total second-order surge Force and pitch moment is also satisfactory. These results could lead to the development of very efficient solutions and corresponding algorithms for the analysis of second-order wave diffraction by more complicated structures such as tension leg platforms. Numerical results based on the present solution show that in many cases, both the first- and the second-order-free surface elevation in the vicinity of a truncated cylinder is very close to that of a bottom-seated cylinder. For waves with larger amplitudes, the maximum free-surface elevation around a vertical cylinder predicted with the second-order theory can significantly exceed that given by linear theory. There is also a considerable difference in the location of the maximum elevation predicted by the linear and nonlinear theories.