NUMERICAL SIMULATION OF FLOW AROUND A SQUARE CYLINDER USING TWO SPLITER PLATE AT LOW REYNOLDS NUMBER

Mechanical Engineering

Control of drag force on a square cylinderusing multiple detached spliter plates is numerically studied for a laminar flow.The two spliter plates with the same length as the cylinder diameter are placed horizontaly in the upstream of the cylender and in the near wake region respectivily. The drag varies with the two gap ratio,it has the minimum value at a certain set of gap ratio for each Reynolds Number 150 and 200.There positions are described by the gap ratio (G1/D,G2/D),where G1 represents the gap between the cylinder stagnation point and the rear edge of the upstream of the spliter plate and G2 represents the gap between the cylinder base point and the leading edge of the rear spliter plate.The upstream spliter plates decreases the stagnation pressure,while rear spliterplate increases the base pressure by supressing vortex sheading. This combined effect causes a signeficant drag reduction on the cylinder. The purpose of the present study is to reduce the drag force over the square cylinder by using a detached splitter plate of length equal to one cylinder height (D) placed at the front and back side of the cylinder. The spliter plate gap between the square cylinder is equal to the one cylinder height (D) . The Spliter plates are placed horizontally in the upstream of the cylinder and in the near wake region. The thickness of splitter plate is 4% of the dimension of square cylinder.

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