[Example 1] Simple curved channel with a 60 degree bend¶
Select a solver¶
From the [Select Solver] window, select [Nys2d+] and click [OK].
A window with [Untitled - iRIC 3.x.xxxx [Nays2d+]] appears.
Select [2d arc grid generator], and push [OK]
Create Computational Grid¶
Select [Channel shape (additional)], set the values as shown in Figure 9 , and click [Create Grid].
Then the [Conformation] window appears as Figure 10 ,and click [Yes].
Then the following window, Figure 11 appears.
For the confirmation of mapping, add tick marks to “grid”, “node attributes”, and “Elevation(m)” in the object browser. A channle with a simple curved channel with straight channels upstream and downstream with parabolic shape section as: numref:01_koushi_5 is shown.
Set Calculation Condition¶
From the main menu, select “Calculation conditions”-> “Settings” from the menu bar.
Then the calculation condition setting window Figure 14 is displayed.
Select [Time and bed erosion parameters] and set values as shown in Figure 16 .
Select [3D Velocity Profile] and set values as shown in Figure 17 .
Finally, click [Save and Close] and finish condition setting.
From the main menu bar, select [Simulation],[Run]. Then if you are asked, [This simulation already has results …] as Figure 18 , just reply [OK] to continue.
When the simulation finished. A message [The solver finished calculation] appears as Figure 20. Click [OK] and the simulation will finish.
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 22 .
With holding down the “Ctrl” button and the right mouse button, you can move around the object by moving the mouse up/down/left/right. It can also be enlarged and shrank by turning the mouse center diamond as, Figure 23 .
In the object browser, put the check marks in “Scalar (node)” and “Depth[m]”, right-click and select “Properties”. The “Scalar Setting” window Figure 24 appears.
Figure 27 shows the depth-averaged velocity vectors.
In Figure 27, you can select “Surface Velocity” and “Bottom Velocity” by chekking each box in “Arrow” group.
It is obvious that, because of the secondly flow, the depth averaged velocity vectors are parallel to the channel banks, the surface velocity vectors are heading to outer bank, and the bottom velocity vectors are heading inner bank.
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 30 will be displayed. By checking “Surface Velocity”, the streamline following the surface velocity” Figure 31 will be displayed. By checking “Bottom Velocity”, the streamline following the bottom velocity ne: numref:01_kekka_11 will be displayed.
The effect of the secondary flow is clearly shown.