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Online Guide to MODFLOW

Navigation: Conduit Flow Process

CFP - Conduit Flow Process

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Abbreviation in Name file

CFP

Purpose

The CFP Input File contains most of the information needed to simulate turbulent flow. For example, the location, geometry, and hydraulic properties of conduit flow pipes are held in the CFP Input File, as well as mean void diameters of preferential flow layers.  

Documentation

Shoemaker, W.B., Kuniansky, E.L., Birk, S., Bauer, S., and Swain, E.D., 2007, Documentation of a Conduit Flow Process (CFP) for MODFLOW-2005: U.S. Geological Survey Techniques and Methods, Book 6, Chapter A24, 50 p.

https://doi.org/10.3133/tm6A24

Related Packages

Conduit Recharge Package (CRCH)

Conduit Output Control File (COC)

Supported in

MODFLOW-CFP

Other Notes

Use convertible layers (LAYCON=2 or 3 in BCF; LAYTYPE = not 0 in LPF; LTHUF = not 0 in HUF2)

Use about 10 time steps per stress period to minimize oscillations in turbulent flow.

Input Instructions

Note the data requirements in the CFP Input File change depending upon the desired turbulent flow Mode. Mode 1 (CFPM1) only requires input for conduit flow pipes and nodes, whereas Mode 2 (CFPM2) only requires input for preferential flow layers. Mode 3 (CFPM3) requires input for conduit flow pipes, nodes, and layers. Additionally, the length (LENUNI) and time units (ITMUNI) in the Discretization (DIS) File of MODFLOW-2005 are used within CFP to calculate conduit flow terms, such as gravitational acceleration and viscosity. Thus, if using units of feet and day in the MODFLOW laminar flow model datasets, then units used in the CFP Input File also must be entered in feet and day.

For each simulation, all variables, characters, and arrays in the CFP Input File are read using free format. The required comment lines are dimensioned for 80 characters.

 

FOR EACH SIMULATION

Data Set 0

[#Text]

Item 0 is a required comment line —“#” must be in column 1.

Data Set 1

Data sets 2-29 are used only if Mode = 1 or 3.

Data Set 2

[#Text]

Required comment line —“#” must be in column 1.

Data Set 3

[#Text]

Required comment line —“#” must be in column 1.

Data Set 4

NNODES NPIPES NLAYERS (read 1 line)

Data Set 5

[#Text]

Required comment line —“#” must be in column 1.

Data Set 6

Data Set 7

[#Text]

Required comment line —“#” must be in column 1.

Repeat data set 8 for each node.

Data Set 8

NO_N  MC  MR  ML  NB1  NB2  NB3  NB4  NB5  NB6  PB1  PB2  PB3  PB4  PB5  PB6

Data Set 9

[#Text]

Required comment line —“#” must be in column 1.

Data Set 10

[#Text]

Required comment line —“#” must be in column 1.

Data Set 11

[#Text]

Required comment line —“#” must be in column 1.

Data Set 12

Data Set 13

[#Text]

Required comment line —“#” must be in column 1.

Data Set 14

Data Set 15

[#Text]

Required comment line —“#” must be in column 1.

Data Set 16

Data Set 17

[#Text]

Required comment line —“#” must be in column 1.

Data Set 18

Data Set 19

[#Text]

Required comment line —“#” must be in column 1.

Data Set 20

Data Set 21

[#Text]

Required comment line —“#” must be in column 1.

Data Set 22

Data Set 23

[#Text]

Required comment line —“#” must be in column 1.

Data Set 24

[#Text]

Required comment line —“#” must be in column 1.

Repeat data set 25 for each pipe.

Data Set 25

NO_P  DIAMETER  TORTUOSITY  RHEIGHT  LCRITREY_P  TCRITREY_P

Data Set 26

[#Text]

Required comment line —“#” must be in column 1.

Repeat data set 27 for each node.

Data Set 27

NO_N    N_HEAD

Data Set 28

[#Text]

Required comment line —“#” must be in column 1.

Repeat data set 29 for each node

Data Set 29

NO_N K_EXCHANGE

Data sets 30-39 are used only if Mode = 2 or 3.

Data Set 30

[#Text]

Required comment line —“#” must be in column 1.

Two required text comment lines read only if MODE equals 2 or 3 from Dataset 1. The following variables are required in the CFP Input File for conduit layers. It is important to remember that when MODE equals 2, the following variables are the only variables needed in the CFP Input File. Also, conduit layers must be convertible layers. For example, conduit layers must be specified as LAYCON = 3 in the BCF Package, LAYTYPE not equal 0 in the LPF Package, or LTHUF not equal 0 in the HUF2 Package.

Data Set 31

[#Text]

Required comment line —“#” must be in column 1.

Data Set 32

Data Set 33

[#Text]

Required comment line —“#” must be in column 1.

Data Set 34

Data Set 35

[#Text]

Required comment line —“#” must be in column 1.

Data Set 36

Data Set 37

[#Text]

Required comment line —“#” must be in column 1.

Repeat lines 38 and 39 for each conduit flow layer.

Data Set 38

[#Text]

Required comment line —“#” must be in column 1.

Data Set 39

VOID   LCRITREY_L   TCRITREY_L

 

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