[energy382]

Hey guys,

is there anyone, who has already meshed a volute (turbine) and give me some advice what's the best blocking approach?

I've meshed the turbine wheel (mixed flow turbine) with ICEM Hexa so far.

Thx in advance!

[energy382]

what about this blocking? any other suggestions or improvements?

[energy382]

sequel to previous posting

[Far]

http://www.youtube.com/watch?v=jsHDi...eature=related

[energy382]

i choose my primary blocking approach

[Far]

nice work

[PSYMN]

Agreed, nice work... But you never showed your final topology

This is the official topology from my tips and tricks ppt... It is just half of 1 out of 117 slides... You can get it in the ANSYS customer portal.

Of course, this just shows the first step. you would then add the Ogrid thru the volute, etc.

VoluteSteps.jpg

[Far]

This is the official topology from my tips and tricks ppt.

Then I should say to PYSMN, "Very very nice work"


Could you please share these master tricks on forum or through pm?

[energy382]

no guys, that's not the blocking i used. i ASKED if this is the best blocking in your opinion, not that i was going to use this blocking
my geomtry also included an outer heatshield and a angular stat_rot interface, not just the volute. so it wasn't that easy

you can see my blocking in the attached pics.

[energy382]

I've still have to add the finishing touches (edge params, smoothing etc)


i can't provide blk. and .tin file in general, cause it's property of my company

[OliverL]

I wasn´t able to find this "tips and tricks ppt" on the ANSYS customer portal. Has anyone found it yet?

[diamondx]

here is the link https://docs.google.com/file/d/0ByIL...BQT3pQMjQ/edit

[OliverL]

Thanks a lot!

[energy382]

Originally Posted by OliverL

Thanks a lot!

as you can see on my statetments, it's not that simple.

especially if you have to regard heatshield geometry etc

tongue is also tough. if your geometry is complex and you're not that experienced in using icem hexa, i would suggest tetra with prism

[PSYMN]

Another good "trick" is to create quad elements in the right pattern...

You can create elements manually under the Edit Mesh tab.

Just lay them out to form the shape you want, including that little Y block region.

Then Extrude them up into Hexa blocks.

Then File => Blocking => Load from Unstructured mesh will turn those into a blocking file.

Then associate that blocking with your actual volute geometry.

Pretty quick way to block a difficult geometry like this.

[raghav]

Hi Simon/ Christoph/ Sijal/ Ali,

Please Check the post :
http://www.cfd-online.com/Forums/ans...ompressor.html

My blocking strategy is not convincing.

Is there any better blocking strategy for this kind of complex Volute?
Can anyone build a topology for this?


Regards,
Raghav

[fabriciotb]

Dear friends,

I'm trying to follow the steps just discussed but I can't do that. Someone could help me?

Thanks.

[bluebase]

Hi Fabricio,

before trying something as complex as a volute i suggest you to do the ICEM tutorials.

A first flaw i can see in you screen, there seem to be no edge-to-curve or similar associations. Only automatic edge-to-surface can be seen (the white edges). These Associations are fast and easy, but are not easily shaped. Check out the screenshots of energy382. You might notice many green edges, which means it's an edge-to-curve association. Also, you might not need as many radial splits as you did. It's just more work to put all vertices in place. Compare this again with energy382's.

For a first attempt to reduce the mess in your blocking, create some circumferential curves for every radial split of your volute to be able to put some edge-to-curve associations.

With regards,
Sebastian

[Far]

Originally Posted by fabriciotb

Dear friends,

I'm trying to follow the steps just discussed but I can't do that. Someone could help me?

Thanks.

see the trick by Simon

Another good "trick" is to create quad elements in the right pattern...

You can create elements manually under the Edit Mesh tab.

Just lay them out to form the shape you want, including that little Y block region.

Then Extrude them up into Hexa blocks.

Then File => Blocking => Load from Unstructured mesh will turn those into a blocking file.

Then associate that blocking with your actual volute geometry.

Pretty quick way to block a difficult geometry like this.

[fabriciotb]

Dear bluebase and Far,

Thanks for all help. I followed your suggestions but I was unsuccessful to create the hexa mesh. The picture shows the problem I have been had.

Could you help me to create this mesh?

Thanks.