ANSYS Fluent

Various hypotheses can be introduced to lighten the computational effort required. For example, Kolaczkowski et al. (2007) approached the simulation of an isolated spherical pellet using the commercial code ANSYS Fluent, adopting a standard Arrhenius expression for the definition of the heterogeneous reaction... 

In line with the proposed approach, which is outlined in Figure 3.4, a non-reactive CFD simulation is performed first using commercial software (ANSYS Fluent in this case), in which the feed stream consists of an inert gas (e.g., argon and nitrogen) with the same flow rate and temperature of the actual reacting mixture (laminar, stationary, and monocomponent model). In the second phase, the flow field is exported from the commercial code by means of a user-defined function (UDF). In the third and final phase, exported data are introduced into a C-F-F code, which solves the transport equations, taking into account both chemical kinetics and reactor fluid dynamics. 

For the hybrid model (ANSYS FLUENT POLYFLOW), the moving parts were taken into consideration using a sliding and dynamic mesh model in FLUENT. As shown in Fig. 4, smoothing and dynamic layering methods were adopted to adjust the mesh of a zone with moving and/or deforming boundaries. The total cell count for the hybrid model is 126,000. 

The commercial software ANSYS FLUENT was used for CFD analysis. Unsteady flow was modeled to obtain the variation of granule temperature with time. The k-to with shear-stress transport turbulence model was used. The modeled flue gases included four gas species, referring to CO2, H2O, N2, and O2. The boundary condition was velocity-inlet at the inlet, pressure outlet at the outlet, and symmetry for the four sides. Second-order upwind scheme was used for the momentum, species, and energy equations. 

The pressure-based solver and the SIMPLE algorithm, as well as the density-based solvers, are implemented into ANSYS Fluent, another CFD package used in many applications [16]. While it is successful in simulating many continuum problems, some additional steps needs to carried out for simulation of the catalytic reactors in ANSYS Fluent. If the catalytic phenomena are described by mechanistic rate laws, these expressions have to... 

A number of papers have reported on CFD modeling with the commercial ANSYS/FLUENT software [13]. Several terms must be defined in conjunction with massive parallel processing prior to discussing different HPC applications. Cortex is a process that provides the user interface and graphics for FLUENT, that is, the graphic user interface (GUI) of ANSYS/FLUENT. ANSYS/FLUENT interacts with the host processor, which organizes and delegates the numerical tasks to different nodes. Each node possesses its own random-access memory (RAM), that is, 24 GB per node and 3 GB per core for the JuRoPA architecture. The host sends a request to the nodes, which store their results directly in parallel on the hard disk. 

Table 25.2 Performance data of different ANSYS/ FLUENT models, namely for a 10-cell PEFC stack in relation to different reformer tasks (Source http //u>unv.ansYs.com/Support/Platform+Support/ Benchmarks+Overvieiv/Archives/ANSYS+Fluent/12.0/).

ANSYS, Inc. (2009) ANSYS FLUENT Theory Guide, Release 12.0, ANSYS, Canonsburg, PA. 

The emergence of personal computing toward the end of the 1980s marks the beginning of widespread CFD-based software modeling tools. Such software tools, popular in scientific and engineering communities, are commercial software tools, such as ACE+ Suite, ANSYS CFX , ANSYS Fluent , ANSYS Multiphysics , COMSOL Multiphysics , FLOW-3D , STAR-CD and STAR-CCM+ , and an open-source software tool OpenFOAM . Other CFD-based software tools, such as AVL FIRE or ANSYS Polyflow , are also available on the market, but they are... 

Commercially available discretization methods for solving complex real-world physical systems are predominantly based on finite volume method and finite element method. The most widely used commercial software tools, such as ANSYS Fluent , STAR-CD , and STAR-CCM+ , are based on finite volume method, whereas ANSYS CFX uses finite element-based control volume method. On the other hand, COMSOL Multiphysics is based on finite element method. Both methods have advantages and disadvantages, but nevertheless they give enough comparable computational results with real-world physical systems. 

With the advance of software engineering, commercially available CFD and multiphysics-based software modeling tools, such as ANSYS CFX , ANSYS Fluent , ANSYS Multiphysics , COMSOL Multiphysics , STAR-CD , or STAR-CCM-t , have sophisticated postprocessing and visualization units incorporated in their products. There are also available stand-alone visualization units, such as ANSYS CFD-Post , AVS/Express , EnSight , or Tecplot 360 , developed by software companies with a specialism in visualization software tools. 

The in situ technique presented above is an invasive technique, in which the probe inside the channel will influence the velocity and species profiles. To be able to evaluate the measured profiles, CFD simulations were performed (Hettel et al., 2013). The CFD code FLUENT (ANSYS Fluent) was applied for the numerical simulation of the three-dimensional flow field in the monolithic stmcture. Transport processes in the solid stmcture were not included in the computations. 

ANSYS FLUENT Academic Research, Release 13.0, ANSYS, Inc. 

Figure 3.24 Mesh partitioning for CFD simulations with parallel computing (METIS algorithm in ANSYS Fluent 14.0).

ANSYS FLUENT. The software was modified to simultaneously solve for the TE phenomena, heat balance, and charge conservation under a steady state. The details of this calculation process were reported in our previous papers [8,9]. A value of 1 kW/m (the standard quantity of solar radiation for the evaluation of a solar panel) was assumed for the energy of the light irradiated on the water lens. The heat input to the top of the module was set at C [kW/m ], where C was a condensing ratio. The temperature at the bottom of the module was fixed at 288.15 K. The heat losses from the module surface due to heat transfer and heat radiation were ignored for simplicity. 

For CFD calculations, the ANSYS Fluent system was used. In order to specify correct boundary conditions, four different zones have been distinguished on the perforated plate and for each zone the separate gas inlet velocities were specified as boundary conditions. The diameter and number... 

The CFD simulation of the MREF can be run over by a commercial code, where appropriate user-defined routines need to be added in order to model chemical reactions and permeation mechanism. In this case we have adopted ANSYS Fluent version 6.3.26 (ANSYS Inc., 2010) the setup for the numerical model is 2D axisymmetric calculator, with double precision, pressure-based solver and steady-state condition. 

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