scholarly journals Inherent Properties of Two Dimension Green Function with Linear Boundary Condition of Free Water Surface

2013 ◽  
Vol 04 (08) ◽  
pp. 97-99 ◽  
Author(s):  
Xing Wang ◽  
Chao Liu ◽  
Zhenli Sun ◽  
Mingyan Wu ◽  
Shesheng Zhang
Keyword(s):  
Boundary Condition ◽  
Green Function ◽  
Water Surface ◽  
Free Water ◽  
Linear Boundary ◽  
Two Dimension ◽  
Linear Boundary Condition ◽  
Free Water Surface

Green Function Cloud Computing Representation with Free Water Surface

2012 ◽  
Vol 170-173 ◽  
pp. 1962-1965
Author(s):  
Xue Jiao Li ◽  
Xing Wang ◽  
Chao Liu ◽  
Meng Yu Li ◽  
She Sheng Zhang
Keyword(s):  
Boundary Condition ◽  
Green Function ◽  
Water Surface ◽  
Free Water ◽  
Two Dimensional ◽  
Function Representation ◽  
Free Water Surface ◽  
The Green Function ◽  
Cloud Computation ◽  
Control Equation

According to the convenient using principle of cloud computation, the control equation and boundary condition of point source with free water surface are considered, the basic analyzing solution is obtained, the Green function representation is discussed., the discrete calculation expression and calculation procedure are proposed, two-dimensional graphics of the Green function’s real and imaginary part are plotted.

Power Generation Potential of a VLFS Equipped With OWC Type WECs and Damper Effects on Elastic Motion

2015 ◽  
Author(s):  
Tomoki Ikoma ◽  
Koichi Masuda ◽  
Yuka Watanabe ◽  
Hiroaki Eto ◽  
Chang-kyu Rheem ◽  
...  
Keyword(s):  
Power Generation ◽  
Boundary Condition ◽  
Wave Energy ◽  
Water Surface ◽  
Free Water ◽  
Vertical Displacement ◽  
Air Pressure ◽  
Linear Potential ◽  
Floating Structure ◽  
Free Water Surface

This paper describes potential of PTO (Power Take-Off) and the damper effect of motion in a large scale pontoon type floating structure on which lots of oscillating water column (OWC) type wave energy convertors (WEC) are installed. It is enable to use upper space for utilizing marine renewable energy such as wind power, tidal power, wave power generation farm using large pontoon structure. Due to the concept, it should reduce cost of maintenance as well. For investigation of PTO and elastic motion behaviours of large floating structures, we calculated three types of models on which OWC devices were installed differently. We examined how much reduction was possible when including elastic motion effects and the fixed type which radiation wave was not taken into account. In this paper, a boundary condition in order to give effect of a free water surface with air pressure is theoretically modeled. We can directly consider influence of wave energy absorption to hydrodynamic forces and wave exciting forces on the floating structure with the Green’s function method based on the linear potential theory. In the modeling, a boundary condition on a free water surface and an equation of state within an air-chamber above OWC are mathematically and linearly formulated. Air-pressures and vertical displacement within OWC areas can be simultaneously and directly solved by setting both the variables and by solving the simultaneously equations of the air-pressure and the vertical displacement. As a result, performance of PTO and hydroelastic motion of the floating structure increased when including elastic motion effect. In addition, expected value of annual PTO was about 4.4MW with 146 OWCs.

scholarly journals Mathematic Model of Green Function with Two-Dimensional Free Water Surface

2013 ◽  
Vol 04 (08) ◽  
pp. 75-79
Author(s):  
Sujing Jin ◽  
Xing Wang ◽  
Junjun Du ◽  
Shesheng Zhang ◽  
Shengping Jin
Keyword(s):  
Green Function ◽  
Water Surface ◽  
Free Water ◽  
Mathematic Model ◽  
Two Dimensional ◽  
Free Water Surface

EFEKTIVITAS TANAMAN GENJER DALAM MENURUNKAN BOD DAN COD LIMBAH CAIR TAHU HASIL PROSES ANAEROB

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Muhammad Irvan Nurliansyah
Keyword(s):  
Water Surface ◽  
Free Water ◽  
Surface Flow ◽  
Free Water Surface

ABSTRAK Limbah cair tahu merupakan limbah cair yang berasal dari proses pembuatan tahu. Limbah cair tahu mengandung senyawa organik yang tinggi. Pembuangan limbah cair tahu secara langsung ke badan air tanpa dilakukan pengolahan dapat mempengaruhi dan mencemari lingkungan. Suatu cara untuk menanggulangi permasalahan tersebut adalah melakukan pengolahan limbah cair tahu. Salah satu alternatif pengolahan limbah cair tahu yang dapat digunakan adalah fitoremediasi menggunakan tanaman genjer. Penelitian ini bertujuan untuk mengetahui efisiensi pengolahan dan efektivitas waktu tinggal pengolahan limbah cair tahu menggunakan tanaman genjer dalam menurunkan BOD dan COD effluen hasil proses pengolahan anaerob limbah cair tahu. Metode yang digunakan dalam penelitian ini adalah fitoremediasi menggunakan tanaman genjer pada sistem lahan basah buatan Free Water Surface flow dengan waktu tinggal 3 hari, 5 hari dan 7 hari. Hasil penelitian menunjukkan bahwa efisiensi pengolahan secara fitoremediasi pada hari ke 3 untuk BOD dan COD berturut-turut sebesar 21,28% dan 16,13%. Pada hari ke 5 efisiensi pengolahan yang diperoleh untuk BOD dan COD berturut-turut sebesar 52,60% dan 45,93% sedangkan efisiensi pengolahan pada hari ke 7 untuk BOD dan COD berturut-turut sebesar 76,42% dan 70,74%. Waktu tinggal efektif yang diperoleh pada penelitian ini adalah  7 hari dengan nilai BOD dan COD telah berada dibawah baku mutu yaitu berturut-turut sebesar 72,72 mg/l dan 213,33 mg/l.   Kata kunci : limbah cair tahu, fitoremediasi, tanaman genjer, efisiensi pengolahan, waktu tinggal

A Free Water Surface Constructed Wetland in Treating Sugarcane Wastewater

2011 ◽  
Vol 33 (1) ◽  
pp. 71-86
Author(s):  
Doorce S. Batubara ◽  
Donald Dean Adrian
Keyword(s):  
Constructed Wetland ◽  
Water Surface ◽  
Free Water ◽  
Free Water Surface
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