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time_step setting

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Dear Office,

I would like to confirm two things about time_step:

1. whether the time_step must be a integer?
2. if I simulate 300m and 100m for domain 1 and domain 2, the time_steps will be 1.8s and 0.6s, do you think they are too short?

Best regards,
You are right that time step must be integer.
For dx=300m, time_step =1.8s is appropriate. You need to specify the time step in the following format:
time_step = 1
time_step_fract_num = 8
time_step_fract_den = 10