A meshfree unit-cell method for effective planar analysis of cellular beams

2017 ◽  
Vol 182 ◽  
pp. 368-391 ◽  
Author(s):  
A.R. Zainal Abidin ◽  
B.A. Izzuddin ◽  
F. Lancaster
Keyword(s):  
Unit Cell ◽  
Cell Method ◽  
Planar Analysis

The Effectiveness of the Unit Cell Method in Numerically Modeling and Designing Liquid Cooled Heatsinks

2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Ali C. Kheirabadi ◽  
Dominic Groulx
Keyword(s):  
Heat Transfer ◽  
Wall Temperature ◽  
Parametric Design ◽  
Unit Cell ◽  
Liquid Cooling ◽  
Cell Method ◽  
Numerical Predictions ◽  
Finite Element Package ◽  
Parametric Studies ◽  
Relative Differences

This study compares two numerical strategies for modeling flow and heat transfer through mini- and microchannel heatsinks, the unit cell approximation, and the full 3D model, with the objective of validating the former approach. Conjugate heat transfer and laminar flow through a 2 × 2 cm2 copper–water heatsink are modeled using the finite element package COMSOL Multiphysics 5.0. Parametric studies showed that as the heatsink channels’ widths were reduced, and the total number of channels increased, temperature and pressure predictions from both models converged to similar values. Relative differences as low as 5.4% and 1.6% were attained at a channel width of 0.25 mm for maximum wall temperature and channel pressure drop, respectively. Due to its computational efficiency and tendency to conservatively overpredict temperatures relative to the full 3D method, the unit cell approximation is recommended for parametric design of heatsinks with channels’ widths smaller than 0.5 mm, although this condition only holds for the given heatsink design. The unit cell method is then used to design an optimal heatsink for server liquid cooling applications. The heatsink has been fabricated and tested experimentally, and its thermal performance is compared with numerical predictions. The unit cell method underestimated the maximum wall temperature relative to experimental results by 3.0–14.5% as the flowrate rose from 0.3 to 1.5 gal/min (1.1–5.7 l/min).

Appropriate utilization of the unit cell method in thermal calculation of composites

2018 ◽  
Vol 139 ◽  
pp. 295-306 ◽  
Author(s):  
Jian-Jun Gou ◽  
Chun-Lin Gong ◽  
Wen-Quan Tao
Keyword(s):  
Unit Cell ◽  
Thermal Calculation ◽  
Cell Method

scholarly journals WANG TILES LOCAL TILINGS CREATED BY MERGING EDGE-COMPATIBLE FINITE ELEMENT MESHES

2017 ◽  
Vol 13 ◽  
pp. 161
Author(s):  
Lukáš Zrůbek ◽  
Anna Kučerová ◽  
Martin Doškář
Keyword(s):  
Finite Element ◽  
Mechanical Response ◽  
Unit Cell ◽  
Cell Method ◽  
Mechanical Field ◽  
Wang Tiles ◽  
Small Set ◽  
Finite Element Meshes ◽  
Heterogeneous Microstructures ◽  
Periodic Unit Cell

In this contribution, we present the concept of Wang Tiles as a surrogate of the periodic unit cell method (PUC) for modelling of materials with heterogeneous microstructures and for synthesis of micro-mechanical fields. The concept is based on a set of specifically designed cells that compresses the stochastic microstructure into a small set of statistical volume elements – tiles. Tiles are placed side by side according to matching edges like in a game of domino. Opposite to the repeating pattern of PUC the Wang Tiles method with the stochastic tiling algorithm preserves the randomness for reconstructed microstructures. The same process is applied to obtain the micro-mechanical response of domains where the evaluation as one piece would be time consuming. Therefore the micro-mechanical quantities are evaluated only on tiles (with surrounding layers of tiles of each addressed tile included into the evaluation) and then synthesized to the micro-mechanical field of whole domain.

Sign in / Sign up

Export Citation Format

Share Document