Validation of the CFD code fluent by post-test calculation of a density-driven ROCOM experiment

Schaffrath, A.; Fischer, Klaus-Christian; Hahm, T.; Wussow, Steffen

doi:10.1016/j.nucengdes.2007.02.029

Cited by 17 publications

(5 citation statements)

References 3 publications

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“…Since the SYRTHES solver is not parallel, it limits the overall performance of NHESDYN. Hence NEPTUNE-CFD/SYRTHES should be replaced by commercial CFD codes numerically stable, robust, and more user friendly such as ANSYS CFX [17] or FLUENT [18]; therefore this will allow the analysis of larger problems making use of massive parallel computers.…”

Section: Discussionmentioning

confidence: 99%

A New Coupled CFD/Neutron Kinetics System for High Fidelity Simulations of LWR Core Phenomena: Proof of Concept

Mañes

Espinoza

Chiva

et al. 2014

Science and Technology of Nuclear Installations

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The Institute for Neutron Physics and Reactor Technology (INR) at the Karlsruhe Institute of Technology (KIT) is investigating the application of the meso- and microscale analysis for the prediction of local safety parameters for light water reactors (LWR). By applying codes like CFD (computational fluid dynamics) and SP3 (simplified transport) reactor dynamics it is possible to describe the underlying phenomena in a more accurate manner than by the nodal/coarse 1D thermal hydraulic coupled codes. By coupling the transport (SP3) based neutron kinetics (NK) code DYN3D with NEPTUNE-CFD, within a parallel MPI-environment, the NHESDYN platform is created. The newly developed system will allow high fidelity simulations of LWR fuel assemblies and cores. In NHESDYN, a heat conduction solver, SYRTHES, is coupled to NEPTUNE-CFD. The driver module of NHESDYN controls the sequence of execution of the solvers as well as the communication between the solvers based on MPI. In this paper, the main features of NHESDYN are discussed and the proof of the concept is done by solving a single pin problem. The prediction capability of NHESDYN is demonstrated by a code-to-code comparison with the DYNSUB code. Finally, the future developments and validation efforts are highlighted.

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Section: Discussionmentioning

confidence: 99%

A New Coupled CFD/Neutron Kinetics System for High Fidelity Simulations of LWR Core Phenomena: Proof of Concept

Mañes

Espinoza

Chiva

et al. 2014

Science and Technology of Nuclear Installations

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“…Similar numerical methods and turbulence model were used by several authors [40][41][42][43][44] both are involved in the actual flow. These studies showed that the RSM model associated with a two layer model fairly predicts the experimental data.…”

Section: Methodsmentioning

confidence: 99%

Vorticity and convective heat transfer downstream of a vortex generator

Lemenand

Habchi

Valle

et al. 2018

International Journal of Thermal Sciences

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Vorticity generation has been identified, since the 80's, as an efficient means for enhancing heat transfer; the mean radial velocity component due to the induced flow pattern contributes to the heat removal. In the present work, momentum and heat transfer are studied in a test section designed to mimic the industrial HEV (High-Efficiency Vorticity) mixer. It consists of a basic configuration with a unique vorticity generator inserted on the bottom wall of a heated straight channel. The aim of this work is to analyze to which extend the convective heat transfer is correlated to the vorticity, as it is presumed to cause the intensification. In this case, the driving vorticity is the streamwise vorticity flux Ω, and the heat transfer is characterized by the Nusselt number Nu, both quantities being spanwise averaged. The study is mainly numerical; we have used the previous PIV measurements and DNS data from the open literature to validate the numerical simulations. It is shown that there exists a strong correlation between the vorticity flux and Nusselt number close to the vortex generator. However, the axial variation diverges for these quantities when moving downstream. The Nusselt number presents a sharp peak over the VG and decreases nearly to its basic level just behind the VG, while the vortex persists far downstream from the tab and relaxes very slowly. Heat transfer intensification at the Nusselt peak is about 100%, and reduces to about 6% downstream of the VG, the intensity of the vorticity momentum being decreased only to about 50% of its peak value at the test section outlet.

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“…In particular, the standard k-E model is the one used most widely (Talal, model is overly diffusive and inaccurate for treating near-wall situations, whereas the RNG k-e model shows the best agreement with the options of enhanced wall treatment (Kang and Strand, 2013). Therefore, in this study, the RNG /c-e model, which was developed by Yakhot and Orzag (1986), was chosen to describe the turbulence flow behavior in the reactor for its default option with "low Reynolds number" and "differential viscosity model" as recommended by FLUENT (Schaffrath et al, 2007).…”

Section: F Ig U R E 2 -S C H E M a T Ic V Ie W O F Th E G R Id D In Gmentioning

confidence: 99%

Optimization Design and Experimental Study of Two‐Phase Integrated Sludge Thickening and Digestion Reactor

Luo

Wang

et al. 2015

Water Environment Research

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In this study, FLUENT software was used to simulate the flow regime of an integrated sludge thickening and digestion reactor. To optimize the flow regime, the combinational effect of key parameters of the reactor structure was investigated with an L16 (4(5)) orthogonal test. The reactor was then redesigned based on the optimization results, and a series of experiments was conducted to study the treatment effect with sludge dosage rates of 12, 18, 24, and 30%. The operation results showed that the reactor obtained the best treatment efficiency when the sludge dosage rate was 24%. At this dosage, the water content of the sludge decreased from 99.1% to 91.8%, with organic matter content (volatile solids [VS]/total solids) decreasing to 21.2% and average gas production (CH4 62.66%, CO2 11.56%, N2 23.91%, O2 1.59%) reaching 231.3 L/kg VS. Therefore, the results implied that the optimized reactor has good effects on sludge thickening and digestion.

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Validation of the CFD code fluent by post-test calculation of a density-driven ROCOM experiment

Cited by 17 publications

References 3 publications

A New Coupled CFD/Neutron Kinetics System for High Fidelity Simulations of LWR Core Phenomena: Proof of Concept

A New Coupled CFD/Neutron Kinetics System for High Fidelity Simulations of LWR Core Phenomena: Proof of Concept

Vorticity and convective heat transfer downstream of a vortex generator

Optimization Design and Experimental Study of Two‐Phase Integrated Sludge Thickening and Digestion Reactor

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