AS-921-21 Resolution on Creation of New Department for Computer Engineering

The Academic Senate approves the creation of a new College of Engineering department, the Computer Engineering Department

OMAE2002-28536 COUPLED DYNAMIC ANALYSIS OF A MINI TLP: COMPARISON WITH MEASUREMENTS

ABSTRACT A numerical code (COUPLE) was recently developed for computing 6 Degree-Of-Freedom (DOF) motions of a moored floating structure dynamically interacting with its mooring/riser/tendon system. The computation of hydrodynamic forces on the moored structure can be conducted based on a diffraction wave theory model, e.g. WAMIT, and/or the Morison Equation based upon a slender body assumption. Wave kinematics up to the free surface, used in the Morison Equation, is computed using nonlinear deterministic Hybrid Wave Models, and is accurate up to second order in wave steepness. Experimental data from the model tests of a mini TLP was used as the basis for investigation of the numerical computation. Using COUPLE and its alternatives, coupled as well as quasi-static analyses were conducted for the mini TLP model that incorporates four risers and four tendons. Two different methods for computing hydrodynamic loads, namely, WAMIT and Morison Equation, were used, respectively. Through the comparison between the numerical results and the corresponding measurements, dynamic interactions between the riser/tendon system and the hull were examined. Findings made in this study, though based upon a mini TLP may have valuable applications to the design and simulation of a wide range of compliant deep-water structures

Industry Program Abstracts, Tenth Compilation

Abstracts for IP-375 through IP-402, July 1959 -November 1959http://deepblue.lib.umich.edu/bitstream/2027.42/93625/1/mmpp008.pd

TIME-DOMAIN SIMULATION OF RISER VIV IN SHEARED CURRENT

ABSTRACT Riser vortex-induced vibrations (VIV) have attracted significant attentions in recent years in offshore oil and gas industry. There is an increasing interest in using computational fluid dynamics (CFD) approach for deepwater riser VIV timedomain simulations. Our previous study has demonstrated that the long riser (L/D=1400) VIV response in uniform current can be predicted with reasonable accuracy by time domain simulations with Chimera over-set data grid technique. This paper is to further that study and investigate the riser VIV in sheared current profiles. The riser studied in this paper is a long marine riser with constant tension distribution. Its prototype has an outer diameter (OD) of 0.027m and a mass ratio of 1.6. The fluid domain is discretised using approximately one million elements. A linearly sheared current is imposed in perpendicular to the riser, and the flow field is calculated using an unsteady Reynolds-Averaged Navier-Stokes (RANS) numerical method in conjunction with a Chimera domain decomposition approach with overset grids. The critical parameters including riser VIV root-mean-square (rms) a/D, vorticity, drag and lift coefficients are processed, and compared to those of uniform current and experimental data. The simulation results show that the riser VIV under sheared current behaves differently from uniform current. It is also shown that the presented CFD approach provides reasonable results and is suitable for long riser VIV evaluation in deepwater and complex current conditions

DEVELOPMENT OF GPU-BASED MONTE CARLO CODE FOR FAST CT IMAGING DOSE CALCULATION ON CUDA FERMI ARCHITECTURE

ABSTRACT This paper describes the development of a Graphics Processing Unit (GPU) accelerated Monte Carlo photon transport code, ARCHER GPU , to perform CT imaging dose calculations with good accuracy and performance. The code simulates interactions of photons with heterogeneous materials. It contains a detailed CT scanner model and a family of patient phantoms. Several techniques are used to optimize the code for the GPU architecture. In the accuracy and performance test, a 142 kg adult male phantom was selected, and the CT scan protocol involved a whole-body axial scan, 20-mm x-ray beam collimation, 120 kVp and a pitch of 1. A total of 9 × 10 8 photons were simulated and the absorbed doses to 28 radiosensitive organs/tissues were calculated. The average percentage difference of the results obtained by the general-purpose production code MCNPX and ARCHER GPU was found to be less than 0.38%, indicating an excellent agreement. The total computation time was found to be 8,689, 139 and 56 minutes for MCNPX, ARCHER CPU (6-core) and ARCHER GPU , respectively, indicating a decent speedup. Under a recent grant funding from the NIH, the project aims at developing a Monte Carlo code with the capability of sub-minute CT organ dose calculations

Poultry litter: great potential for electrical energy generation in Brazil

Abstract. Due to the rapid industrialization and population growth there is a higher energy demand. As a result of this factor the greenhouse effect has been aggravating the weather around the globe. Many countries are seeking for sources of renewable and clean energy in order to reduce the air pollution. The biomass energy is an alternative that may interest everyone, since it is a renewable source and there are several technologies for its processing. This study aims to quantify the generation of poultry litter in the production of broiler chickens in the country, to identify the technologies for the available energy conversion, to quantify the potential for electrical energy generation and indicate through technical analysis the most feasible technology to explore the energy potential. In Brazil the biomass derived from the poultry litter represents 1% of all the available biomass, compared to the straw and sugar cane bagasse, regarding the biomass used in the electrical energy generation this percentage increases to 7%. Using the process which is more efficient (gasification) with the poultry litter produced in the country in 2010 (8.23 X 10 9 kg), it is estimated a production of 503.77MW. This energy may be injected into the network to meet the demand at times of increased consumption

Identification of Cross-Sectional Parameters of Lateral Meniscal Allografts That Predict Tibial Contact Pressure in Human Cadaveric Knees

To guide the development of improved procedures for selecting meniscal allografts, the objective of this study was to identify which cross-sectional parameters of a lateral menisca