This lesson will teach you how to prepare a geometry for analysis and run a solution for RMA2

The geometry has already been created and renumbered.

1) Open file "ld1.geo"

Select RMA2 | Open Geometry

Select file ld1.geo

2) Select RMA2 Material Properties:

Select Material 1 …Be sure that ID is number 1 in the ID edit box.

Make sure Isotropic eddy viscosities toggle is selected.

Enter 25 for E. and 0.025 for n and press the TAB key (that E is for eddy viscosity)

Now following the same steps…..set the eddy viscosity for material #2 to 50 and the mannings n to 0.04

3) DEFINING BOUNDARY CONDITIONS

Select RMA2 | Open BC

Find and select file "ld1_init.bc"

---DEFINING STEADY STATE FLOW AND HEAD

1. Select the Create Nodestrings tool from the Toolbox.
2. Start the string by clicking on the upper left corner node.
3. Hold down the SHIFT key and click on the bottom corner node of the upper inflow boundary. SMS will automatically select all nodes between the two.
4. Press the Enter key, or double click on the last node in the terminate the string.

In a similar fashion, create nodestrings at the other two open boundaries.

After the nodestrings are created boundary data may be assigned to each.

1. Click the Select nodestrings tool in the Toolbox
2. Select the top left nodestring by clicking in the box at the center of it.
3. Select RMA2| Assign BC and click the Flow BC and Steady State radio buttons
4. Assign a value of 55000 (cfs) in the Flowrate edit box and click on the Perp to boundary button for the angle.
5. Press Enter or Click OK.

Use these same steps to define the flow conditions of inlet #2 to Flow = 580 (cfs) and angle Perp to boundary.

1. Select the Right Nodestring, follow the same steps as above except You will now click the HEAD BC

button. This is because the head is defined at the outlet.

2. Assign a Head value of 33.3 feet.
3. Click OK or press ENTER key.

Saving the Boundary Conditions