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Multiphysics Modeling and Simulation of the Effective Thermal Conductivity of Polymeric Composites
Published in Jose James, K.P. Pramoda, Sabu Thomas, Polymers and Multicomponent Polymeric Systems, 2019
Multiphysics is computation modeling paradigm that enables scientists and engineers to combine or couple different physical phenomena (e.g., physics—heat transfer, electrochemistry, structural mechanics, fluid flow, optics, alternating and direct current) to capture the simultaneous happenings of several phenomenal behaviors of a system. The tools or techniques capture the true essence of the multiple behaviors occurring in a real system. The traditional way of engineers and scientists, making assumptions in order to realize their design ideas, has radically been transformed and redefined by Multiphysics. Using Multiphysics, it is possible, as time progresses during the modeling process, to refine and, in some cases, even eliminate these assumptions to obtain more accurate and realistic results. Multiphysics provides the toolset to eliminate assumptions. There are several computer-based software applications for implementing this solution paradigm. The software applications include but are not limited to COMSOL MultiphysicsANSYS MultiphysicsOpen FOAMFEA Tool Multiphysics.
CFD Modeling of Convection Flow in Pan Cooking
Published in Da-Wen Sun, Computational Fluid Dynamics in Food Processing, 2018
The value of the heat flux or heat generation, as the heat source, is required for the CFD analysis. Since the heat flux changes according to the heating conditions, it is necessary to measure the heat flux whenever the heating condition changes. However, if the heat generation in IH can be estimated using electromagnetic field analysis (EFA), the heat flux need not be measured. Thus, in IH, the heat generation distribution in the pan was estimated by EFA using commercial software (JMAG Studio, USA). CFD was customized by FORTRAN programming to introduce the heat generation into the CFD calculation. By a so-called skin effect, the high-frequency current or the electromagnetic field is limited to the surface of the conductor. In addition, since the boiling calculation was not possible with the software used at the time of the study (STORM/CFD2000), it was customized in FORTRAN programming by using the temperature recovery method as follows. The temperature fluctuation with the boiling point (Tb), ΔT = T − Tb, was calculated at each point in the pan. Thus, if ΔT > 0, the sensible heat over the boiling point was considered to be released as latent heat, and this heat was added to the energy conservation law. Nowadays, the features of available computer simulation software, such as COMSOL Multiphysics, enable simulation of these phenomena without additional customization works.
Using a Virtual Engineering Environment for the Design and Development of a Compact Pilot Plant
Published in Fusion Science and Technology, 2021
A commercial tool that offers multiphysics solutions is required. Multiphysics include structural, electromagnetic, thermal, and fluid interactions to name a few, and included finite element analysis, computational fluid dynamics (CFD), and electromagnetic analysis. Multiphysics is an advanced simulation involving multiple physics coupled to mimic the real behavior as accurately as possible; for example, combining fluid mechanics, heat transfer, and chemical kinetics to simulate a reactor. This analysis can range from simple finite difference line elements that carry the piping material and general fluid behaviors to detailed CFD simulations of the flow of liquids and gases by performing millions of numerical calculations. CFD analysis is typically carried out earlier in the design process even before the first prototype is made. Multiphysics involves multiple physics coupled to mimic the real behavior as accurately as possible; for example, combining fluid mechanics, heat transfer, and chemical kinetics to simulate a reactor.
Multiphysics Simulations of a Steady-State Lower Hybrid Current Drive Antenna for the FSNF
Published in Fusion Science and Technology, 2021
G. M. Wallace, T. Bohm, C. E. Kessel
Multiphysics refers to the coupling of multiple physical mechanisms into a single simulation. The RF heating module in COMSOL Multiphysics25 couples the frequency-domain RF simulations discussed previously to time-domain thermal simulations of the antenna modules. In this study, the “physics” incorporated in the simulations are heat transfer, neutron transport/absorption, and RF wave propagation/absorption. The computer-aided design (CAD) geometry of Fig. 1 is shared between the RF and thermal simulations, although the void spaces inside of the waveguides are excluded from the thermal simulations. The time-dependent thermal simulations use a logarithmic time base with ten time steps per decade starting at 0.1 s and running until the temperature asymptotes after 80 to 300 s (depending on the details of the design choices and materials used).
A fully coupled seepage–heat transfer model including a dynamic heat transfer coefficient in fractured rock sample with a single fissure
Published in Geomatics, Natural Hazards and Risk, 2021
Ze Zhang, Shuhong Wang, Tianjiao Yang, Dongsheng Wang, Hong Yin
To evaluate the proposed model from viewpoint of the dynamic heat transfer coefficient, it is applied to simulate the experimental process. All simulations are carried out in COMSOL Multiphysics software. The seepage and the heat transfer modules of the software are combined and the seepage–heat transfer of the dynamic heat transfer coefficient is simulated. The model is meshed by triangular and quadrilateral. In this regard, 22465 triangular meshes, and 2860 quadrilateral meshes are used. The minimum and average unit mass of the model are 0.1357 and 0.821, respectively. The unit area ratio is 6.964 × 10−5. Table 1 presents the physical parameters used in the simulation, which are mainly derived from published articles (Ma et al. 2020). The other geometric parameters are shown in Table 2.