Fluid compressibility has a major influence on the efficiency of switch-mode hydraulic circuits due to the release of energy stored in fluid compression during each switching cycle and the increased flow rate through the high-speed valve during transition events. Multiple models existing in the literature for fluid bulk modulus, the inverse of the compressibility, are reviewed and compared with...

[1] Prediction of water flow and transport processes in soils susceptible to structural alteration such as compaction of tilled agricultural lands or newly constructed landfills rely on accurate description of changes in soil unsaturated hydraulic conductivity. Recent studies have documented the critical impact of aggregate contact characteristics on water flow rates and pathways in unsaturated...

Abstract Dams are important structures for the development and utilization of water resources, dam stability is significantly affected by filter layer. In this paper, eight groups combination seepage tests impermeable materials were conducted. The effects variations in grade, relative density, thickness on resistance performance assessed. test results showed that: material grade affect resistan...

The Adriatic severe bora can partly be explained by the two-dimensional hydraulic theory, as one of the possible mechanisms of a strong surface downslope wind. A comparison of the application of the hydraulic theory shows a similar severe bora mechanism on the northern and mid-Adriatic, with the exception of the Senj area where special bora effects have been observed. As the theory could not co...

The hydrology of alpine and subalpine areas in the Colorado Front Range (USA) is evolving, driven by warming alteration precipitation patterns, timing snowmelt, other components hydrologic budget. Field measurements soil hydraulic conductivity moisture along 30-m transects (n = 13) representative soils developed surficial deposits falling head slug tests shallow groundwater till demonstrate tha...

It is considered the mathematical model of a benchmark hydroelectric power plant containing water reservoir (lake), two conduits (the tunnel and turbine penstock), surge tank hydraulic turbine; all distributed (Darcy-Weisbach) local losses are neglected,the only energy dissipator remains throttling tank. Exponential stability would require asymptotic difference operator associated to model. How...

In this paper the factor of safety (FS) and critical line-segments slip surface obtained by the Alternating Variable Local Gradient (AVLG) optimization method was presented as a new topic in 2D. Results revealed that the percentage of reduction in the FS obtained by switching from a circular shape to line segments was higher with the AVLG method than other methods. The 2D-AVLG optimization meth...

Hydraulic fracturing has been used widely to stimulate production of oil, natural gas, and geothermal energy in formations with low natural permeability. Numerical optimization of fracture stimulation often requires a large number of evaluations of objective functions and constraints from forward hydraulic fracturing models, which are computationally expensive and even prohibitive in some situa...