P equation is used to update the existing pressure and density fields, and the P equation is used to correct the velocity field to ensure continuity of mass.
Based on the SIMPLE, we present here an effective improved method, called secondary pressure correction, which can be used well to resolve the problem in SIMPLE that the solution of pressure-correction equation can be used effectively to correct the velocity but ineffectively or not very well to correct the pressure.
By analysing properties of servo system and location errors,presents the view of using software to determine and improve the properties of servo system,improves location accuracy by the way of correcting speed instructions.
In this algorithm the coefficient of pressure difference influence d u, d v are determined by solving equations. So determined d u, d v serve as the coefficient of the pressure correction equation.
Finally, we AMR for low Mach number reacting flow 11 correct the velocity field to satisfy a divergence constraint on the composite grid system.
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When images from different offsets are not lined up, a residual moveout can be used to correct the velocity model.
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We then use the vector field decomposition to correct the velocity field so that it satisfies the constraint.
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Based on the SIMPLE, we present here an effective improved method, called secondary pressure correction, which can be used well to resolve the problem in SIMPLE that the solution of pressure-correction equation can be used effectively to correct the velocity but ineffectively or not very well to correct the pressure. Numerical calculations for sudden expansion pipe flow have shown that the secondary pressure correction method can clearly accelerate convergence, improve accuracy and save C. P. U time.
A design and implementation method of real-time position differential GPS (Global Positioning System) is discussed in this paper.The differential GPS (DGPS) scheme adopted in this system differs from pscudorange DGPS mainly in that reference station broadcasts position correction-instead of pscudorange correction-nceded for real-time data processing of users. This system has the following main advantages: high positioning accuracy, fast correction, good integrity, simple equipment and easy operation. In the...
The design method of the train’s real-time positioning system using DGPS is investigated.This method uses the strategy of the two-way broadcast position correction between reference station and train carrying positioning unit.Both the driver and the control centre can get the train′s position in real time. The method has the main advantages of high positioning accuracy,fast correction, and good integrity.