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Document Type: FAQ Product(s): Bentley HAMMER Version(s): V8 XM Original Author: Jesse Dringoli, Bentley Technical Support Group
Document Type: FAQ
Product(s): Bentley HAMMER
Version(s): V8 XM
Original Author: Jesse Dringoli, Bentley Technical Support Group
Yes. HAMMER V8 XM uses the same file format as WaterGEMS/CAD V8 XM, so you can directly open the files. All 3 programs conveniently use a .wtg and .wtg.mdb file to store the model data.
The transient results are viewed in the Transient Results Viewer, located under the Analysis menu. The amount of results included in here is determined by the report period, report points and "generate animation data" settings, under Analysis > Calculation Options > Transient calculation option
The starting conditions of the model before a transient occurs are defined in one of two ways. First, you can invoke the WaterGEMS steady state solver (Analysis > Compute initial conditions) to calculate them for you, based on the demands, boundary conditions and other element attributes. This is the same solver that Bentley WaterCAD and WaterGEMS use. The transient solver then uses the computed flows and hydraulic grades as the starting conditions.
Alternatively, you can define your own starting conditions (flow and head) by choosing "true" for the attribute called "specify initial conditions?" in the transient calculation options (Analysis > Calculation options.) When doing this, the transient solver will no longer use the head/flow computed by the "compute initial conditions", but instead will use the head and flow values that you must enter in, in the "transient (initial)" section of each element's properties. Note that if you want to slightly modify some computed initial conditions, you can copy them over to the user defined initial conditions fields first by using the "copy initial conditions" tool (under the Tools menu) and then alter them as you see fit.
First, enter a number for the "Report period" attribute of an element. This represents how often the results will be saved for. For example, a report period of '10' means that results will be shown at every 10 timesteps. Make sure text reports are enabled in the transient calculation options. Now, when you compute initial conditions, extended results will be displayed, under Report > Transient Analysis Reports > Transient Analysis Detailed Report. Scroll down to the bottom to see a table of data for the element(s) with a report period.
The pressure reducing / pressure sustaining / flow control properties of these valves are only used during the initial conditions calculation. This is because HAMMER assumes that during the transient event, these valves cannot react quickly enough to the changes in flow/pressure. If you are running a long transient simulation and need to model the effects of these valves, you'll need to use an operating rule on the valve to close them.
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