Modelling of subcritical free-surface flow over an inclined backward-facing step in a water channel

Příhoda, Jaromír; Zubík, Pavel; Šulc, Jan; Sedlář, Milan

doi:10.1051/epjconf/20122502023

Cited by 5 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the cases when the cylinder is a far from the vertical wall, the fluid moves straightforwardly, vertically upward. This is also mentioned by the authors in [22]. As seen in the figures, where the cylinders are closer to the vertical wall, the fluid moves vertically upward in contact with the vertical wall.…”

Section: Resultssupporting

confidence: 76%

“…As seen in the figures, where the cylinders are closer to the vertical wall, the fluid moves vertically upward in contact with the vertical wall. created by a pressure change at parallel surfaces, which allows the airflow to cling to the surface [21,22]. A significant role is played by the placement of cylindrical surface, heat source, or distance to the wall, which we have examined.…”

Section: Resultsmentioning

confidence: 99%

“…When this phenomenon occurs, the airflow itself is affected by the parallel surface, changes the expected route and flows along the surface, i.e., air clings to surfaces as it flows. The Coanda Effect is created by a pressure change at parallel surfaces, which allows the airflow to cling to the surface [21,22]. A significant role is played by the placement of cylindrical surface, heat source, or distance to the wall, which we have examined.…”

Section: Numerical Simulationmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Heat Source Placement on Natural Convection from Cylindrical Surfaces

2020

View full text Add to dashboard Cite

Placement of heat source can play a significant role in final heat output, or heat source effectivity. Because of this, there is a need to analyze thermal fields of the heat exchange system by natural convection, where the description by criterion equations is desired, as the net heat output from tubes can be quantified. Based on known theoretical models, numerical methods were adapted to calculate the heat output with natural air flow around tubes, where mathematical models were used to describe the heat transfer more precisely. After validation of heat transfer coefficients, the effect of wall and heat source placement was studied, and the Coanda effect was also observed. The heat source placement also has an effect at the boundary layer, which can change and therefore affect the overall heat transfer process. The optimal wall-to-cylinder distance for an array of horizontal cylinders near a wall was also expressed as a function of the Rayleigh number and number of cylinders in the array.

show abstract

Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Numerical Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Heat Source Placement on Natural Convection from Cylindrical Surfaces

2020

View full text Add to dashboard Cite

show abstract

“…Similar investigations of turbulent flow in the open water channel with an inclined step were carried out by PĜíhoda et al [6,7].…”

Section: Introductionsupporting

confidence: 62%

Experimental investigation of turbulent flow in a channel with the backward-facing inclined step

Příhoda

Kotek

Uruba

et al. 2012

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

“…While subcritical flows are widely modeled using CFD and well validated by experiments, simulations of supercritical and especially near-critical flows are more complicated and less validated. In [7][8][9], simulations and their validation of subcritical, supercritical as well as the near-critical flows over an inclined backward-facing step in an open channel can be found. The range of the Froude numbers (1) is between 0.42 and 2.14.…”

Section: Introductionmentioning

confidence: 99%

Modeling Flow Phenomena in Pump Station with Overflow

Sedlář¹,

Příhoda²,

Vyroubal³

2019

dtcse

Self Cite

View full text Add to dashboard Cite

This paper deals with the numerical analysis of flow in a complete hydraulic system representing the pump station including the influence of the free water level. Particular attention is paid to the discharge object with overflow, which is characterized by the critical flow across the crown of the overflow wall. All basic calculations were accomplished by means of the commercial software ANSYS CFX and ANSYS Fluent with the SST turbulence model. As the flow in the discharge object represents the most interesting part of the results, additional numerical simulations of flow just inside this object were carried out with the DDES scale resolving simulations. Basic calculations inside the complete pump station passage gave surprisingly steady water level in both the intake and discharge objects. They also provided a good picture of the distribution of water velocity close to the water level and corresponding height of water level above the overflow wall crown. DDES simulations indicated a periodically formed vortex on a water level behind the overflow wall crown, with a (not very distinct) Strouhal number about 0.3.

show abstract

Modelling of subcritical free-surface flow over an inclined backward-facing step in a water channel

Cited by 5 publications

References 7 publications

Effect of Heat Source Placement on Natural Convection from Cylindrical Surfaces

Effect of Heat Source Placement on Natural Convection from Cylindrical Surfaces

Experimental investigation of turbulent flow in a channel with the backward-facing inclined step

Modeling Flow Phenomena in Pump Station with Overflow

Contact Info

Product

Resources

About