DHI MIKE 3 Flow Model FM User Manual

Transport module

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MIKE 3 Flow Model FM

Transport Module

User Guide

MIKE 2017

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Page 1 MIKE 3 Flow Model FM Transport Module User Guide MIKE 2017...
Page 3 DHI. For details please refer to your 'DHI Software Licence Agreement'. LIMITED LIABILITY The liability of DHI is limited as specified in Section III of your 'DHI Software Licence Agreement': 'IN NO EVENT SHALL DHI OR ITS REPRESENTATIVES...
Page 5 CONTENTS...
Page 7: About This Guide
Purpose About This Guide Purpose The main purpose of this User Guide is to enable you to use, MIKE 3 Flow Model FM, Transport Module, for applications of transport phenomena in lakes, estuaries, bays, coastal areas and seas. The User Guide is complemented by the Online Help. Assumed User Background Although the Transport Module has been designed carefully with emphasis on a logical and user-friendly interface, and although the User Guide and...
Page 8: Validation Window
F1-key on the keyboard after opening the editor and activating the spe- cific property page. Open the Online Help system for browsing manually after a specific  help page: Open the Online Help system by selecting “Help Topics” in the main menu bar. Transport Module FM - © DHI...
Page 9: Introduction
Application Areas Introduction MIKE 3 Flow Model FM is a new modelling system based on a flexible mesh approach. The modelling system has been developed for applications within oceanographic, coastal and estuarine environments. Figure 2.1 Odense Estuary, Denmark. Computation mesh used in MIKE 3 Flow Model FM for studying hydrodynamics and ecosystem dynamics.
Page 11: Getting Started
Getting Started The hydrodynamic basis for the Transport Module must be calculated using the Hydrodynamic Module of the MIKE 3 Flow Model FM modelling system. If you are not familiar with setting up a hydrodynamic model you should refer to the comprehensive step-by-step training guide covering MIKE 3 Flow Model FM.
Page 13: Examples
One of the best ways of learning how to use a modelling system such as MIKE 3 Flow Model FM is through practice. Therefore an example is included which you can go through yourself and which you can modify, if you like, in order to see what happens if one or other parameter is changed.
Page 14: Defining The Problem
2 hours (7200 seconds) to avoid chock effects. A point source discharging 250 m /s is applied at the southernmost point  in the computational domain. The source is placed in the top layer. Transport Module FM - © DHI...
Page 15: Presenting And Evaluating The Results
Funningsfjord Tidal elevations, consisting of a M component with amplitude 1.0 m, are  applied at the open boundary along the NE section. The main condition defining the hydrodynamic problem is: Transport calculations are performed for two components: One conserv- ...
Page 16 Examples Figure 4.3 Contour plot of the concentration in the top layer for the conservative component (top) and the decaying component (bottom). Transport Module FM - © DHI...
Page 17: List Of Data And Specification Files
The following data files (included in the \TR\Funningsfjord folder) are supplied with MIKE 3 Flow Model HD FM: File name: Funningsfjord.mesh Description: Mesh file including the mesh and bathymetry File name: Funningsfjord.m3fm Description: MIKE 3 Flow Model FM specification file...
Page 18 Examples File name: Wind.dfs0 Description: Wind speed and direction File name: Tide.dfs0 Description: Tidal elevations at open sea boundary Transport Module FM - © DHI...
Page 19: Transport Module
Component Specification TRANSPORT MODULE The transport module calculates the resulting transport of materials based on the flow conditions found in the hydrodynamic calculations. Component Specification On this dialog you specify the number of components (or species) and the name of the components that should be solved for. Each component defines a separate transport equation.
Page 20: Dispersion
Hence, dispersion in horizontal and vertical directions is specified separately. The dispersion is specified individually for each component. 5.3.1 Dispersion specification The dispersion can be formulated in three different ways No dispersion  Dispersion coefficient formulation  Scaled eddy viscosity formulation  Transport Module FM - © DHI...
Page 21: Recommended Values
Dispersion Selecting the dispersion coefficient formulation you must specify the disper- sion coefficient. Using the scaled eddy viscosity formulation the dispersion coefficient is cal- culated as the eddy viscosity used in solution of the flow equations multiplied by at scaling factor. For specification of the eddy viscosity see section 6.5 Eddy Viscosity in the manual for the Hydrodynamic module.
Page 22: Decay
The data must cover the complete simulation period. The time step of the input data file does not, however, have to be the same as the time step of the hydrodynamic simulation. A linear interpolation will be applied if the time steps differ. Transport Module FM - © DHI...
Page 23: Remarks And Hints
Precipitation-Evaporation 5.4.1 Remarks and hints The decay may affect the stability of the numerical solution, in a way similar to the advection or diffusion terms. If the decay represent a very rapid pro- cess such that the product kt>1 the decay term may be the source of insta- bility or at least occurrence of negative concentrations.
Page 24: Recommended Values
A linear interpolation will be applied if the time steps differ. Transport Module FM - © DHI...
Page 25: Sources
Sources For the case with concentration varying both in time and domain you have to prepare a data file containing the concentration (in component units) before you set up the hydrodynamic simulation. The file must be a 2D unstructured data file (dfsu) or a 2D grid data file (dfs2). The area in the data file must cover the model area.
Page 26: Remarks And Hints
The initial conditions are specified individually for each component. Transport Module FM - © DHI...
Page 27: Boundary Conditions
Boundary Conditions Data The format of the initial concentration (in component unit) for each compo- nent can be specified as Constant (in domain)  Varying in domain  For the case with varying in domain you have to prepare a data file containing the concentration (in component unit) before you set up the hydrodynamic simulation.
Page 28 You can specify a soft start interval (in sec) during which boundary values are increased from a specified reference value to the specified boundary value in order to avoid shock waves being generated in the model. The increase can either be linear or follow a sinusoidal curve. Transport Module FM - © DHI...
Page 29: Outputs
Outputs 5.10 Outputs Standard data files with computed results from the simulation can be speci- fied here. Because result files tend to become large, it is normally not possi- ble to save the computed discrete data in the whole area and at all time steps.
Page 30 For 3D field data the third item must be an integer for the Layer number if discrete values are selected and a float (real number) for the z-coordinate if interpolated values are selected. The layers Transport Module FM - © DHI...
Page 31 Outputs are numbered 1 at the bed and increasing upwards. The last item (the remaining of the line) is the name specification for each point. You must also select the map projection (Long/Lat, UTM-32, etc.) in which you want to specify the horizontal location of the points. If "discrete values"...
Page 32 The layer number(s) selected for the volume output are numbered 1 at the lowest layer and increase upwards. In case of a combined sigma-z level mesh only the elements containing water are saved in the output. An exam- ple is shown in Figure 5.2. Transport Module FM - © DHI...
Page 33 Outputs Figure 5.2 Example of layer numbers in volume output specification in case of combined sigma-z level mesh. Cross section series You must specify the first and the last point between which the cross section is defined. The cross section is defined as a section of element faces. The face is included in the section when the line between the two element centers of the faces crosses the line between the specified first and last point.
Page 34: 5.10.2 Output Items
The accumulated volume/mass error contains the contribution due to correc- tion of the transported component when the values become larger than the specified maximum value or lower than the specified minimum value. For the Transport Module FM - © DHI...
Page 35 Outputs water volume the minimum value is 0, while there is no upper limit. For the component concentrations the minimum values are -1010, while the maxi- mum values are 1010. Discharge You can select the discharge calculation to be included for the flow and for the transported components.
Page 37: List Of References
LIST OF REFERENCES Delhez, E. J. M., Deelersijder, E., Maouchet, A., Beckers, J. M.(2003), On the age of radioactive tracers, J. Marine Systems, 38, pp. 277-286. Holmes, D. G. and Connell, S. D. (1989), Solution of the 2D Navier- Stokes on unstructured adaptive grids, AIAA Pap. 89-1932 in Proc. AIAA 9th CFD Conference.
Page 39: Index
INDEX...
Page 41 Index Vertical dispersion ..21...

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