TUFLOW 2D Cell Size Selection

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This page is currently under construction.

Introduction

This page of the TUFLOW Wiki discusses 2D cell size convergence. Cell size convergence refers to the tendency for model results to tend towards a common answer as cell size decreases. This behaviour occurs due to topographic features that influence the hydraulic flow behaviour better approximating reality as resolution increases. The series of creek cross-section images below demonstrate this. As model resolution increases from 20m to 5m the modelled topography progressively matches the real-world geometry more closely.
Mesh Converge XS 20m.png
Mesh Converge XS 10m.png
Mesh Converge XS 05m.png

Test Case 1 - Scenario Assessment

Test Case 1 - Model Description

This test is designed to simulate flood wave propagation down a river valley following the failure of a dam. The valley DEM is ~0.8 km by ~17 km and the valley slopes downstream on a slope of ~0.01 in its upper region, easing to ~0.001 at lower elevations.
Mesh Converge Model Description 001.png
Mesh Converge Model Elevation 001.png
The inflow hydrograph shown below is applied as a boundary condition at the upstream end of the valley.
Mesh Converge Model Inflow 001.png

Test Case 1 - Results

Cell Size Location 4 Result Location 5 Result Mesh Resolution Figure
10m Mesh Converge Exg P4 010.png Mesh Converge Exg P5 010.png Mesh Converge Grid 010.png
20m Mesh Converge Exg P4 020.png Mesh Converge Exg P5 020.png Mesh Converge Grid 020.png
50m Mesh Converge Exg P4 050.png Mesh Converge Exg P5 050.png Mesh Converge Grid 050.png
100m Mesh Converge Exg P4 100.png Mesh Converge Exg P5 100.png Mesh Converge Grid 100.png
150m Mesh Converge Exg P4 150.png Mesh Converge Exg P5 150.png Mesh Converge Grid 150.png
200m Mesh Converge Exg P4 200.png Mesh Converge Exg P5 200.png Mesh Converge Grid 200.png
250m Mesh Converge Exg P4 250.png Mesh Converge Exg P5 250.png Mesh Converge Grid 250.png

Rural Assessment Result Discussion

Urbanised Catchment Scenario Assessment

Urban Model Description

Urban Assessment Results

Urban Assessment Result Discussion

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