HydroGeoSphere/Wells

Well domains, can be set up using the following instructions, as outlined in Section 2.3.2.2 and in Equation 2.55. The variable radius corresponds to , while the pumping rates , use the new boundary condition format as described in Section 5.7. Default Well Properties Unless the user modifies the default values, all well zones in the domain will be assigned the default properties. The default values, Table 5.8, can be and are recommended to be modified to fit the model application. +Table 5.8Table 5.8: Default Values for Well Properties Parameter Value Unit Screen Radius 1 × 10−5 m Coupled Conductivity 7.438 × 10−5 m s−1 Coupled Length 1 × 10−4 m Well Type Hagen-Poiseuille - Manning’s Friction Coefficient 0.0548 m−1/3 s Hazen Williams Coefficient 130 m0.37 s−1 • • • Example Well Instructions As an example, the following set of instructions, with prefix.wprops file Figure 5.12, could be inserted into the prefix.grok file to produce a pumping well: use domain type well properties file prefix.wprops clear chosen segments choose segments polyline !Screen interval 2 100. 100. 0. 100. 100. 20. new zone 1 clear chosen zones choose zone number 1 read properties well one clear chosen nodes choose node !Bottom of pump intake 100. 100. 0. create node set well boundary condition type flux nodal name well node set well time value table 0.0 -80.0e-3 !Pumping duration and rate end end The well domain example opens the property file prefix.wprops, shown in Figure 5.12, and creates a 20 m long screen located at x = 100 and y = 100 with a pump intake located at z = 0. The well one properties are read into grok and a steady pumping rate is set at -80 × 10−3 m3 s−1. If the flowrate is set to zero, the well is passive but can still transmit water vertically through its screen. Figure 5.12 !------------------------------------------ well one radius 0.05d0 coupling length 1.0e-4 coupling conductivity .0023 end Figure 5.12: Sample well domain property file prefix.wprops • • • Radius Scope: .grok .wprops WellScreenRadius Well Screen Radius [L]. The radius of the screen interval of the well. • • • Infilled Scope: .grok .wprops WellPropsInfilled Infilled well properties name from .mprops file. This command should be included in the input file for an infilled well. The default values are a sand as described in Table 5.7. • • • Hagen Poiseuille Scope: .grok .wprops This command should be included in the input for the Hagen Poiseuille flow option. • • • Hazen Williams Scope: .grok .wprops This command should be included in the input file for the Hazen Williams flow option. • • • Manning Scope: .grok .wprops This command should be included in the input file for the Manning flow option. • • • Friction Scope: .grok .wprops well_friction Manning’s Well Friction. • • • Hazen Williams coefficient Scope: .grok .wprops well_hw_coeffient Hazen-Williams well coefficient. • • • Saturated wells Scope: .grok .wprops This instruction causes wells to remain fully saturated. • • • Dual nodes for wells Scope: .grok .wprops This instruction causes well flow scheme to use dual node approach. • • • Coupling conductivity Scope: .grok .wprops WellPropsCplCond Coupling conductivity for well [L T−1]. Coupling conductivity parameter only required for the dual node approach for wells. • • • Coupling length Scope: .grok .wprops WellPropsCplLngth Coupling length for well [L]. Coupling length parameter only required for the dual node approach for wells. • • •