Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90∘∘^{\circ} bend

MOHAMMAD VAGHEFI; MOHAMMAD SHAKERDARGAH; MARYAM AKBARI

Makale detayları

Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90∘∘^{\circ} bend

Yazarlar:

MOHAMMAD VAGHEFI | MOHAMMAD SHAKERDARGAH | MARYAM AKBARI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2014 Vol.38 Issue 2, pp.266-277

Belge Tipi:

Makale

Yayın Tarihi:

1/2014

Belge Dili:

Türkçe

Document ID (Org No.):

2000744520

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160

Özet:

 

A spur dike is a structure that projects from a stream bank into the river channel and causes a redirection of flow away from the bank toward the tip of the spur dike. Construction of a spur dike against the flow causes significant changes in flow pattern in the channel. In this study, the flow pattern around a 25% submerged T-shaped spur dike in a 90∘∘^{\circ} bend with rigid bed and various Froude numbers 0.2, 0.34, 0.45, and 0.6 was examined using FLOW-3D software. Numerical results were compared with experimental results and analyzed. The results indicated that in cross section around the spur dike, when Froude number increases, the formed vortexes decreased by 35%. Longitudinal velocity and lateral velocity increased twice as much as their former values. The highest amount of vertical velocity was observed between the wing of the spur dike and the external bend, and closer to the external bend, with an increase in Froude number, vertical velocity components variations decreased by 33%. Moreover, the results indicated that when the Froude number increases, the width of the separation zone increases, but the change in the length of the separation zone in different levels is negligible.

 

A spur dike is a structure that projects from a stream bank into the river channel and causes a redirection of flow away from the bank toward the tip of the spur dike. Construction of a spur dike against the flow causes significant changes in flow pattern in the channel. In this study, the flow pattern around a 25% submerged T-shaped spur dike in a 90∘∘^{\circ} bend with rigid bed and various Froude numbers 0.2, 0.34, 0.45, and 0.6 was examined using FLOW-3D software. Numerical results were compared with experimental results and analyzed. The results indicated that in cross section around the spur dike, when Froude number increases, the formed vortexes decreased by 35%. Longitudinal velocity and lateral velocity increased twice as much as their former values. The highest amount of vertical velocity was observed between the wing of the spur dike and the external bend, and closer to the external bend, with an increase in Froude number, vertical velocity components variations decreased by 33%. Moreover, the results indicated that when the Froude number increases, the width of the separation zone increases, but the change in the length of the separation zone in different levels is negligible.

Makale detayları

Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90∘∘^{\circ} bend

Yazarlar: MOHAMMAD VAGHEFI | MOHAMMAD SHAKERDARGAH | MARYAM AKBARI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Engineering and Environmental Sciences 2014 Vol.38 Issue 2, pp.266-277

Belge Tipi: Makale

Yayın Tarihi: 1/2014

Belge Dili: Türkçe

Document ID (Org No.): 2000744520

Sıklık: Üç Yıllık

eISSN: 1303-6157

pISSN: 1300-0160

Sayı

Yazarlar:

MOHAMMAD VAGHEFI | MOHAMMAD SHAKERDARGAH | MARYAM AKBARI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2014 Vol.38 Issue 2, pp.266-277

Belge Tipi:

Makale

Yayın Tarihi:

1/2014

Belge Dili:

Türkçe

Document ID (Org No.):

2000744520

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160