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ANGULAR VELOCITY FAN

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Hi, i'm trying to lounch my analysis of bird strike in aeronautical fan. I don't know to impose angular velocity at fan, how can i do ?

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Altair Forum User

Hi,

Choose the direction as XX to apply rotational Imposed velocity

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Altair Forum User

thanks Prakash, if my intensity are -314.152 rad/s which fields i have to fill?

gopal_rathore

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

Altair Forum User

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)

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gopal_rathore

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

Altair Forum User

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.

gopal_rathore

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

Altair Forum User

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)

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It seems You have applied the IMPVEL for rotational to each node.

Try applying it on the master node of the blades centre.

Altair Forum User

Also use a skew and check if that helps

Altair Forum User

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.

Altair Forum User

Thank you all, your help is very usefull. There is a tutorial in altair library?

Altair Forum User

look attentive to the @Prakash Pagadala profile=) you will find i hope=)

Altair Forum User

I think this example on RADIOSS help will be self-explanatory for imposed velocity

RD-E: 5501 Fan Blade Rotation Initialization

Altair Forum User

RD-E: 5501 Fan Blade Rotation Initialization

thank you all, i have done it !

Altair Forum User

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 ?

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Altair Forum User

Yes, please.

Altair Forum User

thank you, i send you 2 model, one with rigid and one with constraints applied directly on the blades.

Altair Forum User

Hi @nicola.andreini

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!!

Altair Forum User

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)?

Altair Forum User

i supposed that the effect on the latest picture maybe came from centrifugal forces. what do you think Prakash ?

Altair Forum User

Prakash i solve the problems with Velocity, at the end of analysis the results doesn't appear. do you know why ?

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gopal_rathore

Hi,

Share 0001.out files and 0001. rad file also

Altair Forum User

Unable to find an attachment - read this blog

Altair Forum User

HI @nicola.andreini

I am glad that you are able to solve it.

Do you see A0## files in your working directory?

gopal_rathore

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

Altair Forum User

yes there are A0## file and there is hyperview file but look like demaged.

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Altair Forum User

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?

Altair Forum User

thank you Prakash, i try. ( it's possible that the errore came from control card ?)

Altair Forum User

I don't think so.

try renaming the file as shown in the image and open the same in HV.

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