ANGULAR VELOCITY FAN
Altair Employee
Answers
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c
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Hi,
Choose the direction as XX to apply rotational Imposed velocity
<?xml version="1.0" encoding="UTF-8"?>
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thanks Prakash, if my intensity are -314.152 rad/s which fields i have to fill?
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Hi,
You need to define a curve for this.. Go to XY plots>Curve Editor and then make curve as foll.
If constant angular velocity at t=0
x y
0.0 -314.152
0.1 -314.52
If angular velocity is rising with time:
x y
0.0 0.0
0.1 -314.52
For direction i.e XX, YY, ZZ you can use either global coordinate system or local coordinate system
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thank a lot for reply, i do as you said but the values of velocity are constant along the span as you can see in this pictures. (constant angular velocity)
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
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Yes this is condition where you will have constant velocity right from starting i.e t-=0
If you increase the velocity with time use 2nd curve I have shown above
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I follow all the steps but the angular velocity doesn't work, i tryed sono times to change the parameters but i failed every time.
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Can you elaborate more on this like are you seeing no velocity in animation files?
Check energy plots also.
Can you share the model file
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Altair Forum User said:
thank a lot for reply, i do as you said but the values of velocity are constant along the span as you can see in this pictures. (constant angular velocity)
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
It seems You have applied the IMPVEL for rotational to each node.
Try applying it on the master node of the blades centre.
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Also use a skew and check if that helps
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hi, it's not correct.
you rotate all nodes.
you should rotate onle reference node in circle.
and if you use BC's manager you should check it in model brouser (load container). i have always trouble with them it don't create curves to container.
i hope it will help you.
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Thank you all, your help is very usefull. There is a tutorial in altair library?
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look attentive to the @Prakash Pagadala profile=) you will find i hope=)
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I think this example on RADIOSS help will be self-explanatory for imposed velocity
RD-E: 5501 Fan Blade Rotation Initialization
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Altair Forum User said:
RD-E: 5501 Fan Blade Rotation Initialization
thank you all, i have done it !
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Hello, i use ' initial velocity around axis' but when i run my analysis this is the results. I try to change dof but the same error appear. If i share my file can you help me to impose velocity ?
<?xml version="1.0" encoding="UTF-8"?>
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Yes, please.
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thank you, i send you 2 model, one with rigid and one with constraints applied directly on the blades.
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Thank you for the files, but I didn't check at my end yet.
Looks like the problem is coming from the boundary conditions. Can you please the same?
I will check the file and I will reply ASAP!!
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Thank you a lot Prakash, yes i think the problems are in boundary condition and in imp. Velocity (i deleted it on the model i send you). Can you add in the model the angular velocity (314.152 rad/s)?
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i supposed that the effect on the latest picture maybe came from centrifugal forces. what do you think Prakash ?
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Prakash i solve the problems with Velocity, at the end of analysis the results doesn't appear. do you know why ?
<?xml version="1.0" encoding="UTF-8"?>
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Hi,
Share 0001.out files and 0001. rad file also
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I am glad that you are able to solve it.
Do you see A0## files in your working directory?
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Hi,
Please check the folder , there you will see A001 and A002 files. These are animation and needs to be opened in Hyperview
T01 files represent the time history output. This needs to be opened in hypergraph
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yes there are A0## file and there is hyperview file but look like demaged.
<?xml version="1.0" encoding="UTF-8"?>
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HI,
I think you have a h3d file in your folder. Due to (italic A) it couldn't open in HV.
Can you rename the result file to a different name and check if that helps?
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thank you Prakash, i try. ( it's possible that the errore came from control card ?)
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I don't think so.
try renaming the file as shown in the image and open the same in HV.
<?xml version="1.0" encoding="UTF-8"?>
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