Re: [sumo-user] Flow-Density MFD Plots

[Mirko Barthauer <m.barthauer@xxxxxxxxxxx>]

Dear Manikanta,

 

the "number" attribute refers to an absolute number of vehicles. If you want to vary the flow duration but keep the flow rate constant (and the vehicles' distances at insertion all the same), you are better off using the "vehsPerHour" attribute. There you enter the number of vehicles you would expect for an hour of this flow. Changing the flow duration will scale the number of vehicles proportionally.

 

The instable part of the fundamental diagram (high density) is difficult to reproduce. Even this example in our documentation shows very few data points at high densities.

 

Best regards

Mirko

 

 

 

 

-----Original-Nachricht-----

Betreff: [sumo-user] Flow-Density MFD Plots

Datum: 2023-12-13T07:18:50+0100

Von: "Desu Venkata Manikanta via sumo-user" <sumo-user@xxxxxxxxxxx>

An: "Desu Venkata Manikanta via sumo-dev" <sumo-dev@xxxxxxxxxxx>

 

 

 

TCS Confidential

Hi Team,

 

I am confused of two concepts in SUMO.

1. How the insertion of vehicles will happen, if i use same "number" in flow command.
2. For the same number of vehicles, will the simulation end time effect the insertion rate.

Basically, I want to plot the MFD by setting the max number of vehicles with number attribute in flow. I am using the density value from the edgeStats output file. However, I am not able to get the bottom U-shaped curve for flow-density graph. I have referred the circular loop in docs, but no improvement.

 

Please guide me how to get this graph.

 

Regards

Manikanta

TCS Confidential

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