feflow_user_manual_classic.pdf

In transfer rate 10000 assign global out transfer

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In-transfer rate 0 10000 Assign-global Out-transfer rate 0 40000 Assign-global 10 4 ms 1 m 1 10 4 10 4 md 1 10 4 d 1 10 4 d 1
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NPO ö rëÉêÛë j~åì~ä J m~êí ff NMK qìíçêá~ä NMKPKQKQ qê~åëéçêí Ç~í~ The Mass-transport initials remain on the default value of 0 mg/l. j~ëë íê~åëéçêí ÄçìåÇ~êáÉë Time-constant boundary conditions: In the Mass-transport boundaries menu the two contaminant sources have to be defined. After set- ting the Join tool for joining via Lines, push the Load button of the Join menu to load the file mass_source.lin . A database-selection dialog pops up asking for a database table. Click on Cancel in order to import only the geometrical data. The nodes to be covered by mass-transport boundaries are then dis- played. Click 1st kind and select Mass , enter a value of 50 mg/l in the Keyboard request box , hit the <Enter> key and click on the line at the sewage plant (western contamination site) for assigning the time-constant boundary conditions. Time-varying boundary conditions: We do not want to ignore the fact that the waste- deposit site (eastern contaminant site) started its opera- tion three years after the sewage plant. As the sewage plant is active during the whole simulation time we can keep the corresponding boundary condition time-con- stant. However, we have to assign a time-varying mass boundary condition for the deposit site. Click on Time-varying function IDs. The Power-function editor pops up. Click on New ID above the scroll list. A new empty power function is created. You can provide a short comment for the function in the Comment line , e.g., ’waste massbc’. This is useful if many time- varying functions are created which cannot be identi- fied easily by their IDs. Click on Edit time list and type the lines of Table 10.4 in the appearing editor. Click on Okay to return to the Mass-transport boundaries menu and assign the time-varying bound- aries at the waste-deposit site using the corresponding power function ID 5. Note that the toggle below the Time-varying function IDs button has been set auto- matically from Time constant to ID of 5, allow- ing to assign the ID in the same way as a time-constant value. `çåëíê~áåíë The procedure is similar to the setting of potential constraints for flow boundaries. The only exception is here that two different types of constraints can be assigned: The first one can be described as comple- mentary constraint, similar to the flow boundaries. The other type is the setting of Min. and Max. values for the hydraulic head. Only in the range defined by these val- ues will the contaminant mass boundary be active. We will set a minimum value for the sewage plant to make sure that the contamination only becomes active if the aquifer is wetted. See the online Help for more details.
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