[Example 3] Flow in a Sine-Generated Curve Channel

Create Computational Grid

From the main menu, select [Grid], [Select Algorithm to Create Grid] ( Figure 57 )

../_images/koshi_0.png — Figure 57 : Select Algorithm to Create Grid

Select [Simple Grid Generator] in Figure 58 , and click [OK].

../_images/koshi_1.png — Figure 58 : Select Grid Creation Algorithm

Set “Channel Shape” values as Figure 59

../_images/koshi_2.png — Figure 59 : Grid Creation: Channel Shape

Set “Channel Bed Condition” values as Figure 60 , and click [Create Grid]. Click [Yes(Y)] when you are asked “Figure 61 . Then the grid creation is completed.

../_images/koshi_3.png — Figure 60 : Grid Creation: Channel Bed Condition

../_images/koshi_4.png — Figure 61 : Mapping？

Bed configuration and channel shape can be confirmed by putting checking marks at, [Grid], [Node attributes] and [Elevation (m)]. ( Figure 62 )

../_images/koshi_5.png — Figure 62 : Grid Creation Completed

Computational Condition

From the menu bar, select [Calculation Condition], [Settings] and [Calculation Condition] window, Figure 63 appears.

../_images/joken_12.png — Figure 63 : Calculation Condition: Groups

In Figure 63 , select [Discharge and downstream water surface elevation] and click [Edit].

../_images/joken_21.png — Figure 64 : Input discharge hydro graph

Input discharge hydrograph as shown in Figure 64 and click [OK].

../_images/joken_32.png — Figure 65 : Time and bed erosion parameters

Select [Time and bed erosion parameters] and set values as Figure 65 .

../_images/joken_42.png — Figure 66 : [Other computational parameters

Select [[Other computational parameters] and set values as Figure 66 .

../_images/joken_52.png — Figure 67 : 3D Velocity Profile

Set [3D Velocity Profile] as Figure 67, and click [OK]

Launch Computation

../_images/jikko_11.png — Figure 68 :Launch Computational

By selecting [Simulation] and [Run], a window as Figure 68 appears, and the simulations starts.

../_images/jikko_21.png — Figure 69 :Simulation Fished

When the simulation finish, Figure 69 appears. Then click [OK].

Display Computational Results

After the companion finished, form the main menu, by selecting [Calculation Results] and [Open new 2D Post-Processing Window], a new Window appears as Figure 70 .

../_images/kekka_12.png — Figure 70 :2D Post-Processing Window

Depth

In the object browser, put the check marks in “Scalar (node)” and “Depth[m]”, right-click and select “Properties”. The “Scalar Setting” window Figure 71 appears.

../_images/kekka_22.png — Figure 71 :Scalar Setting

Set the values as shown in Figure 71, and click [OK], then Figure 72 appears.

../_images/kekka_32.png — Figure 72 : Depth Plot

Velocity vectors

In the object browser, put the check marks in “Arrow” and “Velocity”, right-click and select “Properties”. The “Arrow Setting” window Figure 73 appears. Set the values as Figure 73, and click [OK].

../_images/kekka_52.png — Figure 73 :Arrow Setting

Figure 74 shows the depth-averaged velocity vectors.

../_images/kekka_62.png — Figure 74 :Depth Averaged Velocity Vectors

In Figure 74, you can select “Surface Velocity” and “Bottom Velocity” by checking each box in “Arrow” group.

../_images/kekka_72.png — Figure 75 : Surface Velocity Vectors

../_images/kekka_82.png — Figure 76 : Bottom Velocity Vectors

Stream Lines

Uncheck the box by “Arrow” in the Object Browser and check a box by “Streamline”. By checking “Velocity”, the streamlines following the depth averaged flow velocity” Figure 77 will be displayed. By checking “Surface Velocity”, the streamline following the surface velocity” Figure 78 will be displayed. By checking “Bottom Velocity”, the streamline following the bottom velocity ne: numref:03_kekka_11 will be displayed.

../_images/kekka_92.png — Figure 77 :Streamlines by depth averaged velocity

../_images/kekka_102.png — Figure 78 :Streamlines by surface velocity

../_images/kekka_112.png — Figure 79 :Streamlines by bottom velocities

The effect of the secondary flow is clearly shown.

Particle Animation

In the object browser, uncheck the box of [Streamlines], and check the boxes of [Particles] and [Velocity], and set the time bar back to zero, as shown in Figure 80 Click small black play button, and particle animation starts as Figure 81, which shows the particles following depth averaged flow.

../_images/kekka_121.png — Figure 80 : Starting of Particle Animation

../_images/kekka_13.gif — Figure 81 : Animation of particles following the depth averaged velocity

In the same way, the particle flowing animations can be played by checking a box at [Surface Velocity], and [Bottom Velocity], respectively.

../_images/kekka_14.gif — Figure 82 : Animation of particles following the surface velocity

../_images/kekka_15.gif — Figure 83 : Animation of particles following the bottom velocity