Darmawan, Steven CFD INVESTIGATION OF FLOW OVER A BACKWARD-FACING STEP USING AN RNG k-ε TURBULENCE MODEL. International Journal of Technology 10(2): 280-289. ISSN 2086-9614
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Abstract
Backward-facing step (BFS) is a benchmarked geometry for visualizing recirculation flow and
validating turbulence models. Nowadays, numerical analysis with the CFD method has became
more popular and has stimulated research involving CFD without avoiding the experimental
method. In this paper, flow over a BFS was numerically investigated with an RNG k-ε turbulence
model to predict recirculating flow. BFS geometry refers to the geometry proposed by Kasagi &
Matsunaga; it is three-dimensional, with inlet Re = 5.540. The paper aims to investigate the
performance of the RNG k-ε turbulence model over a BFS. Two important parameters were
analayzed: the performance of the RNG k-ε on the recirculation zone and on the reattachment
length. Recirculation flow is presented by the x-velocity for Y = 17.4 mm and Y = 34.9 mm. In
these Y-section, the RNG k-ε is compared to the STD k-ε and both models show the recirculation
flow occurred from X = 0 mm to about X = 200 mm. The following results were obtained. The
RNG k-ε predicted a slightly higher x-velocity component than that predicted by the STD k-ε.
This result shows that the RNG k-ε turbulence model is suitable for predicting recirculation flow
on the BFS. The reattachment length was measured by non-dimensional X/h to the x-velocity
component with the RNG k-ε turbulence model. The analyzed data were taken from X/h = 4.5 to
X/h = 10, on the x-velocity component from Y = 17.4 mm. The reattachment point was achieved
at X/h = 7.22, close to that achieved by Kasagi & Matsunaga of X/h = 6.51.
| Item Type: | Article |
|---|---|
| Subjects: | Artikel |
| Divisions: | Fakultas Teknik > Teknik Mesin |
| Depositing User: | Puskom untar untar |
| Date Deposited: | 23 Sep 2022 03:02 |
| Last Modified: | 23 Sep 2022 03:02 |
| URI: | https://repotest.untar.ac.id/id/eprint/37238 |
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