CFD simulation of a heated round jet of sodium in forced flow regime (TEFLU benchmark)
| dc.contributor.author | Aragonese, Cosimo | |
| dc.contributor.author | Buono, Stefano | |
| dc.contributor.author | Fotia, Giorgio | |
| dc.contributor.author | Maciocco, Luca | |
| dc.contributor.author | Moreau, Vincent | |
| dc.contributor.author | Sorrentino, Luca | |
| dc.date.accessioned | 2014-06-10T07:42:02Z | |
| dc.date.available | 2014-06-10T07:42:02Z | |
| dc.date.issued | 2000-11-17 | |
| dc.description.abstract | The results of the simulation of the forced-flow case of the TEFLU benchmark [1], obtained at CRS4 with the Star-CD code, are reported. First, a comparison among different k-ε turbulence models implemented in Star-CD was carried out. The Chen k-ε model [4], [5] gave the best agreement with experimental results. Then, a study of the influence of the turbulent Prandtl number Prt was carried out. The first step was the comparison between the molecular conductivity and the turbulent heat diffusion coefficients, calculated using the turbulent Prandtl number approach (Reynolds analogy). It was found that that the two contributions are of the same order of magnitude. This result implies that there is a strong interaction between the molecular and turbulent heat transfer, which could have a strong effect on the scaling coefficient between the turbulent transfer of momentum and heat, namely on Prt. In order to study the effect of the variation of Prt on the temperature profiles, the inlet turbulence kinetic energy profile was scaled in order to obtain a good agreement between calculated and experimental velocity profiles. Then, the value of Prt was changed from the standard value of 0.9 to 10 (on the basis of the considerations of Jisha and Rieche [6]) and to 104 (to exclude the contribution of the turbulent heat transfer). A very good agreement with experimental measurements was found in both cases (the best being the case of no turbulent heat transfer). The above results indicate that the heat conduction is predominant in the forced-flow case. In this situation, the standard value 0.9 of Prt yields an overestimation of the thermal diffusion rate. | IT |
| dc.identifier.uri | http://hdl.handle.net/11050/1004 | |
| dc.language.iso | en | IT |
| dc.subject | CFD | IT |
| dc.subject | turbulence model | IT |
| dc.subject | forced-flow | IT |
| dc.subject.een-cordis | EEN CORDIS::FISICA E SCIENZE ESATTE::Fisica::Fisica dei fluidi | IT |
| dc.subject.een-cordis | EEN CORDIS::FISICA E SCIENZE ESATTE::Matematica, statistica::Modellazione matematica | IT |
| dc.title | CFD simulation of a heated round jet of sodium in forced flow regime (TEFLU benchmark) | IT |
| dc.type | Report | IT |