how to start fire at a time different from 0?

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Mohammad Tavakol

Jan 27, 2023, 1:32:37 PMJan 27
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Hello everyone. 
I am trying to simulate some field-scale grassland fires but the problem is that the fire starts exactly when the simulation is started and does not let the wind fully develop. So, i would be very thankful if you could help me how to solve this issue. how to start the fire at a desired time? 
I am using vents to start the ignition. 
Thank you

Kevin McGrattan

Jan 27, 2023, 1:47:14 PMJan 27
Use a RAMP. More in the FDS User Guide.

Dave Sheppard

Jan 28, 2023, 1:07:45 PMJan 28
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If you want to start a model where there is an existing velocity field, try using a UVWFILE. This functionality is described in the 'Velocity Field' section of the user's guide.

To use this functionality you run a model (with or without a fire) and have the model develop its initial velocity field.  The velocity field in the domain can be saved in a UVWFile.

Then in subsequent models the UVWFile from the first run is used to define the initial velocity field at the start of the model runs.

Mohammad Tavakol

Jan 29, 2023, 4:37:58 PMJan 29
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Thanks every body. that was really helpful.
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