|
|
| (13 intermediate revisions by one other user not shown) |
| Line 1: |
Line 1: |
| <div class="title">Suspended Sediment Test in Channel</div> | | <div class="title">Suspended Sediment Test in Channel</div> |
|
| |
|
| This case provides a fundamental check of the ability of a model to 1) represent a simple flow, 2) flux material from the bed, and 3) develop a suspended-sediment profile.
| | The previous contents of this page have been move to their proper location: [[TEST_CHAN_CASE]]. |
| | |
| [[Image:Test_case_1.gif|center]] | |
| | |
| ==Domain==
| |
| | |
| The model domain is a long, narrow rectangular box, with a flat bottom.
| |
| | |
| {| border="1"
| |
| !Model Parameter
| |
| !Variable
| |
| !Value
| |
| |-
| |
| |Length
| |
| |<math>l</math>
| |
| |10000 m
| |
| |-
| |
| |Width
| |
| |<math>w</math>
| |
| |1000 m
| |
| |-
| |
| |Temperature
| |
| |<math>T</math>
| |
| |<math>20^{o} C</math>
| |
| |}
| |
| | |
| ==Bottom Sediment==
| |
| | |
| {| border="1"
| |
| !Model Parameter
| |
| ! Variable
| |
| ! Value
| |
| |-
| |
| |Size
| |
| |<math>D_{50}</math>
| |
| |0.15 mm
| |
| |-
| |
| |Density
| |
| |<math>\rho_{s}</math>
| |
| |<math>2650 \,kg/m^{3}</math>
| |
| |-
| |
| |Settling Velocity
| |
| |<math>w_{s}</math>
| |
| |0.001 m/s
| |
| |-
| |
| |Critical Shear Stress
| |
| |<math>\tau_{c}</math>
| |
| |<math>0.05 \,N/m^{2}</math>
| |
| |-
| |
| |Porosity
| |
| |<math>\phi</math>
| |
| |0.90
| |
| |}
| |
| | |
| An infinite supply of sediment (not erosion, no armoring) is used.
| |
| | |
| ==Forcing==
| |
| | |
| Inflow boundary condition only <br>
| |
| No rotation <math>(f=0)</math><br>
| |
| No wind<br>
| |
| No heating/cooling<br>
| |
| | |
| ==Boundary Conditions==
| |
| | |
| Inflow maintained as steady flow, depth-mean flow <math><u> = 1 \,m/s </math><br>
| |
| Outflow = open <br>
| |
| Sides = walls with no fluxes, no friction <br>
| |
| Bottom roughness <math>Z_{0} = 0.005</math> <br>
| |
| Sediment flux calculated by model <br>
| |
| Surface = free surface, no fluxes <br>
| |
| | |
| ==Analysis Data==
| |
| | |
| Velocity profile at x = 8000 m <br>
| |
| Suspended sediment profile at x = 8000 m <br>
| |
| Time series of net rate of sediment flux from bed and/or concentration at specified levels <br>
| |
| | |
| ==Physical Constants==
| |
| | |
| Gravitational acceleration <math>g \,= \,9.81 m/s^{2}</math><br>
| |
| Von Karman's constant <math>\kappa \,= \,0.41</math><br>
| |
| Water density <math>\rho_{w} \,= \,998 kg/m^{3}</math><br>
| |
| Dynamic viscosity (and minimum diffusivity)<math>\nu \,= \,1e-6 \,m^{2}/s</math><br>
| |
| | |
| '''Note:''' If a model incorporates physical constants that differ from these, and/or automatically calculates some values specified here, please specify the values used.
| |
| | |
| ==Results==
| |
| | |
| {|border="1"
| |
| !
| |
| !<math>\partial\eta\backslash\partial x</math>
| |
| !<math> u^{*} (m^{2}\backslash s^{2})</math>
| |
| |-
| |
| |calculated
| |
| |4.00e-5
| |
| |0.0625
| |
| |-
| |
| |ANA
| |
| |4.21e-5
| |
| |0.0643
| |
| |-
| |
| |<math>\kappa-\varepsilon</math>
| |
| |3.98e-5
| |
| |0.0626
| |
| |-
| |
| |MY25
| |
| |3.00e-5
| |
| |0.0544
| |
| |}
| |
