Marine biofouling is a global problem that is detrimental to both moving ships and static underwater devices.Marine microorganisms tend to attach to any unprotected surface and grow into biofilm,which can be hardly re...Marine biofouling is a global problem that is detrimental to both moving ships and static underwater devices.Marine microorganisms tend to attach to any unprotected surface and grow into biofilm,which can be hardly removed even under high shear flow condition[1].With the long-term accumulation of marine organisms,ships suffer significantly from the increase on the net weight as well as the drag when cruising.Increased drag causes fuel power penalties of up to86%at cruising speed;it is notable even a very thin layer展开更多
In the work, it is shown the numerical investigations about the unsteady inviscid results obtained for the pitching oscillating wings at different angles of attack. The results are obtained by solving the unsteady Eul...In the work, it is shown the numerical investigations about the unsteady inviscid results obtained for the pitching oscillating wings at different angles of attack. The results are obtained by solving the unsteady Euler equations in a body_fitted coordinate system. It is based on the four_stage Runge_Kutta time stepping scheme. Meanwhile to increase the time step that is limited by Courant limit (CFL), the implicit residual smoothing with local variable parameters is used. As a result, the unsteady aerodynamics about a rectangular wing and a delta wing, which are oscillated in pitching with different frequencies, are shown in this paper. The properties of the unsteady aerodynamics in these cases are researched here.展开更多
Magnesium alloy is known as a kind of green structural material in the 21 st century with excellent application performance.As the lightest structural metallic material currently,magnesium alloy is featured by high sp...Magnesium alloy is known as a kind of green structural material in the 21 st century with excellent application performance.As the lightest structural metallic material currently,magnesium alloy is featured by high specific strength,high specific stiffness,good shock absorption,good resistance to impact load,superior electromagnetic shielding,no biotoxicity,good resistance to organics and alkaline corrosion,and abundant reserve,etc.展开更多
基金supported by the U.S.National Science Foundation(Grant No.DMR-1410853)the faculty start-up fund at Wayne State University,Chemical Engineering and Materials Science
文摘Marine biofouling is a global problem that is detrimental to both moving ships and static underwater devices.Marine microorganisms tend to attach to any unprotected surface and grow into biofilm,which can be hardly removed even under high shear flow condition[1].With the long-term accumulation of marine organisms,ships suffer significantly from the increase on the net weight as well as the drag when cruising.Increased drag causes fuel power penalties of up to86%at cruising speed;it is notable even a very thin layer
文摘In the work, it is shown the numerical investigations about the unsteady inviscid results obtained for the pitching oscillating wings at different angles of attack. The results are obtained by solving the unsteady Euler equations in a body_fitted coordinate system. It is based on the four_stage Runge_Kutta time stepping scheme. Meanwhile to increase the time step that is limited by Courant limit (CFL), the implicit residual smoothing with local variable parameters is used. As a result, the unsteady aerodynamics about a rectangular wing and a delta wing, which are oscillated in pitching with different frequencies, are shown in this paper. The properties of the unsteady aerodynamics in these cases are researched here.
文摘Magnesium alloy is known as a kind of green structural material in the 21 st century with excellent application performance.As the lightest structural metallic material currently,magnesium alloy is featured by high specific strength,high specific stiffness,good shock absorption,good resistance to impact load,superior electromagnetic shielding,no biotoxicity,good resistance to organics and alkaline corrosion,and abundant reserve,etc.
