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Confused with rpm setting in the Single Fluid Rotating Machinery (constant velocity)
Posted 20.07.2011, 20:35 GMT-4 Fluid & Heat, Parameters, Variables, & Functions 1 Reply
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Hi,
The question arises from the model "baffled_mixer" in the Model Gallery. (Rotating Machinery, Laminar Flow)
The impeller is rotating at 10rpm (constant velocity).
But when they set the rpm under Variables, this is what it appears like:
Name: rpm
Expression: 10[1/min]*step1(t[1/s])
Description: Revolutions per second
Could someone explain what "step1(t[1/s])" portion is means?
If I change the step time (from 0.25s to 0.5s), would it change the 10rpm to a different value then?
Does 10[1/min]*step1(t[1/s])
represent constant velocity with no acceleration?
The question arises from the model "baffled_mixer" in the Model Gallery. (Rotating Machinery, Laminar Flow)
The impeller is rotating at 10rpm (constant velocity).
But when they set the rpm under Variables, this is what it appears like:
Name: rpm
Expression: 10[1/min]*step1(t[1/s])
Description: Revolutions per second
Could someone explain what "step1(t[1/s])" portion is means?
If I change the step time (from 0.25s to 0.5s), would it change the 10rpm to a different value then?
Does 10[1/min]*step1(t[1/s])
represent constant velocity with no acceleration?
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1 Reply Last Post 21.07.2011, 06:18 GMT-4
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Posted:
1 decade ago
Hi JC
In this case step1 was ramp function from 0 to 1 at certain time period. Function can be found somewhere but I don't remember where (I don't have Comsol available now, so I can't check).
Best regards
Tero
In this case step1 was ramp function from 0 to 1 at certain time period. Function can be found somewhere but I don't remember where (I don't have Comsol available now, so I can't check).
Best regards
Tero