¶ Installation, licensing, interfacing
¶ Q: What kind of hardware does DYNAMIZU require?
A: DYNAMIZU will run on any PC (Windows 11 suggested) or Mac using a Windows emulator like Parallels. For larger jobs ample memory (16Gb or more) and fast multicore processors are recommended.
¶ Q: How do I use the hardlock (delivered with mobile licenses)?
A: Plug the USB hardlock into any computer that has DYNAMIZU installed, and at the licensing page in DYNAMIZU select “Use Hardlock”. DYNAMIZU will work as long as the key is inserted and the license is valid. The key can be moved to any computer which has DYNAMIZU installed.
The XXX.XX.X ID on the keyring is a client.producttype.product# identifier from our database. You will need to refer to this if you have a problem or at renewal.
¶ Modeling scope
¶ Q: What is the most important first step in modelling?
A: Proper influent fractionation is the most important step - please use the Influent Tool in Input Setup - selecting the influent - bottom middle.
¶ Q: Can DYNAMIZU be used for simulation of different water treatment applications?
A: MizuPro, DYNAMIZU’s default model library, can directly handle various water sources such as rivers, lakes and industrial effluent. Each feed source includes influent fractions and model parameters, eliminating the need for adjustments. However, for special feed with unique components, model modifications are necessary. This is feasible since DYNAMIZU, like SUMO, is open-source, and Dynamita also provides this service.
¶ Q: Are the DYNAMIZU models whole-plant models?
A: Yes, MizuPro model library describes behavior in the whole plant, aerobic, anoxic, anaerobic conditions, solids treatment. The kinetic rates are applied everywhere except in non-reactive units (for example volumeless separators)
¶ Working with DYNAMIZU
¶ Q: How do I choose how much detail I need in my Process Units?
A: Each Process Unit has several (more or less complex) model implementations in Configure - bottom left pane.
¶ Q: Can I set input parameters (e.g. volumes) for several reactors at the same time?
A: You can select several units by drawing a rectangle around them and change a common variable (e.g. volume) at the same time if the value is the same.
¶ Q: Can I copy process units? Will they preserve their input parameters?
A: You can copy process units, whole plants with all parameters - even into a different DYNAMIZU Configuration. The Process Unit or plant will be copied with all input parameters.
¶ Q: Why are my pipes different shades of grey?
A: Pipe colors indicate TSS concentration - effluent should be light grey. In the User settings it is possible to select a different variable and define a different color scale.
¶ Q: Can I rearrange columns and rows in an output table?
A: Yes, both are feasible. Columns can be reorganized by dragging the column header and dropping it to the desired slot. Rows can be rearranged similarly: first highlight the row(s) to be moved with the mouse, then drag and move the pointer out to the bottom left screen panel for a moment, and finally drop the rows to the desired new place.
¶ Q: What are “Fast” and “Accurate” Simulation modes?
A: Numerical solvers (steady-state and dynamic) are quite complex and use different approaches in DYNAMIZU. Depending on model complexity, different settings may be more useful.
• Fast: “Most of the time” the model will run faster and be sufficiently accurate (except very large models)
• Accurate: “Most of the time” the model will run somewhat slower but will present very accurate results. We found biofilms run usually faster in Accurate mode.
Think of the two buttons as “Mode1” and “Mode2” - it is easy to try which one is best for a specific configuration.
¶ Q: Is there Undo in DYNAMIZU?
A: Yes, there is Undo - just like in Excel, CTRL-Z, to unlimited level. Available from the Edit menu as well. Redo is CTRL-Y.
¶ Q: Can I run optimization, sensitivity analysis and Monte Carlo simulations in DYNAMIZU?
A: These modes (except Monte Carlo) are directly available in DYNAMIZU in addition to the normal steady-state and dynamic runs. Monte Carlo will still need a Python connection through the Digital Twin Toolkit (In Python all other simulation modes are also available).
¶ Troubleshooting
¶ Q: My model cannot solve steady-state, what do I do?
A: 1) Try the other (Fast or Accurate) solver. 2) run a dynamic simulation for several HRTs, then retry. 3) Do not use Reset once the model is in a good condition - Reset will switch back state variables to their factory settings, that may not be representative for your system.
¶ Q: Why is my DO input CSTR not keeping the DO setpoint?
A1: The DO setpoint will not be met if the blower capacity (maximum airflow) is insufficient.
A2: If the DO setpoint is zero, it may not be met due to DO recycles or surface DO intrusion.
¶ Q: My model is very slow – how do I speed it up?
A: Slow or stalled model runs are most often caused by:
- Incorrect inputs to the model. Please doublecheck all flows, volumes, any parameters that you changed, including biokinetic model parameters of the selected model.
- Model formulation problems if you developed your own model (custom model). We can help for a small fee.
- If input flow is intermittent to (a part of) the plant, it is a good practice to leave a small minimum flow to the part that is switched off.
- Layered models (e.g. biofilms) will run faster using the accurate solver.
If you cannot find the mistake, please contact us and send the configuration in email (.msumo) format with the description of the error and the steps to reproduce it.
¶ Q: How can I approach you with a support question?
A: Please contact us with your support questions and send your configuration in email (.msumo) format (File menu > Export to email) with the description of the error and the steps to reproduce it.
¶ Advanced features
¶ Q: Custom code: Where do I insert my own models into DYNAMIZU?
A: In the install location there is a "Process Code" folder - this is the standard DYNAMIZU library, and must not be changed. Custom code has to be inserted into the proper place in “My Process Code”. It can be easily reached from the View | Directories | My Process Code menu.