TUFLOW Version Backward Compatibility: Difference between revisions
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| Uses a new set of defaults for a number of commands (see <font color="blue">Defaults</font>).
| The new defaults may produce slightly different results. For established models run using the 2006-06-XX builds, use <font color="blue">Defaults == PRE 2007-07-AA</font> to use the default settings used by the 2006-06-XX builds. Testing of a range of models has shown zero change in results if <font color="blue">Defaults == PRE 2007-07-AA</font> switch is set. Each of the new default settings and their affects are discussed in the rows below.
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| Change <font color="blue">Zero Material Values to One == OFF</font> (previously ON)
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| Fixed bug that did not correctly apply the reduction in conveyance for a FC BD (bridge deck) of FD (floating deck) cell using the 2d_fc Mannings_n attribute.
| Backward compatibility applied if <font color="blue">Defaults == PRE 2007-07-AA</font> is set, however, note that this reinstates the bug and the resistance to flow at FC BD and FD cells may need to be reviewed. Indications are that only minor changes in results occur. The flow area under 2D FC BD and FD cells is correctly calculated.
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|colspan="3"| '''2006-06-XX Builds'''
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| rowspan=16| 2006-06-AA
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| Uses a new set of defaults for a number of commands.
| The new defaults will produce different results. For established models run using the 2005-05-XX builds, use <font color="blue">Defaults == PRE 2006-06-AA</font> to use the previous default settings. Each of the new default settings and their affects are discussed in the rows below.
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| <font color="blue">Cell Wet/Dry Depth == 0.002</font> previously 0.05) and <font color="blue">Cell Side Wet/Dry Depth == 0.001</font> (previously 0.03)
| The most pronounced effect of the shallower wet/dry depths is likely to occur in areas that are still filling at the flood peak, such as behind a levee that is only just overtopped. The shallower wet/dry depths provides a greater flow depth for a longer period over the levee.
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| <font color="blue">Adjust Head at ESTRY Interface == OFF</font> (previously ON)
| Usually does not have a major influence on results except where very high velocities occur.
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| <font color="blue">Boundary Cell Selection == Method C</font> (previously Method A) and <font color="blue">Line Cell Selection == Method C</font> (previously Method A)
| May select slightly different cells along boundary/link lines. This may cause a difference where the line is along the top of levee, possibly creating a “hole” in embankment.
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| <font color="blue">Viscosity Formulation == Smagorinsky</font> (previously Constant) and <font color="blue">Viscosity Coefficient == 0.2</font> (previously 1.0)
| Can have a significant effect where the viscosity term is influential. This occurs where the friction term is less dominant (i.e. low Manning’s n and/or deeper water such as the lower, tidal, reaches of rivers).
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| <font color="blue">Structure Losses == ADJUST</font> (previously FIX)
| Can have a significant affect in the vicinity of structures within a 1D network and for culvert networks. Does not affect 1D structures linked to a 2D domain or at the structure ends not connected to another 1D channel.
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| <font color="blue">Storage Above Structure Obvert (%) == 5</font> (previously Storage Above Structure Obvert == CHANNEL WIDTH)
| Usually negligible effect unless the model storage is predominantly within 1D closed sections (i.e. B, C and R channels). The 1D domain is likely to be more sensitive to instabilities due to the much smaller storage above the top of the closed sections, therefore, a smaller 1D timestep may be required and/or the Storage Above Structure Obvert (%) increased.
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| <font color="blue">Depth Limit Factor == 10</font> (previously 1)
| No effect as previously the model would have become “unstable” as the trigger for an instability was the top of the channel/node.
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| <font color="blue">Culvert Flow == Method C</font> (previously Method B)
| Usually only minor effects plus improved stability.
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| <font color="blue">Culvert Add Dynamic Head == ON</font> (previously OFF)
| Minor influence.
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| <font color="blue">Bridge Flow == Method B</font> (previously Method A)
| Negligible influence plus improved stability. However, note the different treatment of energy losses once the bridge deck obvert/soffit is submerged if a BG or LC table is specified.
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| <font color="blue">WLL Approach == Method B</font>(previously Method A)
| Only affects the presentation of results. Note, that Method A is no longer recommended or supported.
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| <font color="blue">Apply All Inverts == ON</font> (previously OFF)
Does not affect hydraulic calculations, however, if a Blank, B or W channel is now lowered/raised because the inverts are now used, this will affect results/stability - see note at end of Apply All Inverts).
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| <font color="blue">Conveyance Calculation == ALL PARALLEL</font> (previously CHANGE IN RESISTANCE)
| Will affect results as ALL PARALLEL can be around 10% more “slippery” than CHANGE IN RESISTANCE. For calibrated or established models developed using build prior to Build 2006-06-AA , recommend setting to CHANGE IN RESISTANCE
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| <font color="blue">Flow Calculation == Method B</font> (previously Method A)
| Negligible effect.
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|'''Builds prior to 2006-06-XX'''
| Contact <font color="blue">support@tuflow.com</font>
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