[malay]

Hi all , sorry for this question , i am new in ICEM ...
how can mesh this geometry ?

triangular channel in rectangulat solid , water inside the triangular channel ...

[stuart23]

Are both domains fluid? Ie the entire box minus the triangular prism is one domain and the triangular prism is a second domain?

The boxminus the triangular prism is the more interesting of the domains. There are two different topologies that spring to mind. The choice really comes down to your actual model; what surfaces are inlets/outlets/walls etc.? These will dictate the flow directions, then you can choose a mesh topology that aligns itself best with this.

The first potential topology is a simple 3D block split three times along the length, and the assosiate vertices to the corners of the triangle

The other potential topology is a C grid arond the triangular prism propogated out to the far walls. This will give you better alignment if the triangle is a source or a sink.


Stu

[malay]

yes the entire box minus the triangular prism is one domain( solid ) and the triangular prism is a second domain( fluid)

[malay]

thanks stuart23 for reply , can more explain ?

[Far]

simple possible solution, four blocks

[malay]

Originally Posted by Far

simple possible solution, four blocks

thanks Far.... I did this blocks but the mesh quality appeared poor , especially at the corner of triangular prism ...

[diamondx]

that's why you need to add a Y-grid. it is the best suitable for those kinf of corners.
Take a look at the project i attached

[malay]

Originally Posted by diamondx

that's why you need to add a Y-grid. it is the best suitable for those kinf of corners.
Take a look at the project i attached

thanks ali .... can explain to me how you take the block for tringular prism ?? i mean how to devide the geometry to 5 blocks ( one of them to triangular prism ) ......

thank you so much ..

[diamondx]

take a look at this video:
http://www.youtube.com/watch?v=InyeCmEuUVM
y-grid is created, also some vertices are merged. everything you need is in this video.
time to go to sleep... see you tomorrow

[malay]

Originally Posted by diamondx

take a look at this video:
http://www.youtube.com/watch?v=InyeCmEuUVM
y-grid is created, also some vertices are merged. everything you need is in this video.
time to go to sleep... see you tomorrow

thank you so much my bro ..... good night ...

[Far]

slide the vertices of the middle downward to improve the quality. Or

1. Insert Y Block

2. Put O-grid

[malay]

Originally Posted by Far

slide the vertices of the middle downward to improve the quality. Or

1. Insert Y Block

2. Put O-grid

thanks Far ..... i get confuse when i try to make Y-block

[Far]

check this http://www.cfd-online.com/Forums/ans...tices-why.html

and http://www.cfd-online.com/Forums/ans...here-cube.html

[malay]

Originally Posted by Far

check this http://www.cfd-online.com/Forums/ans...tices-why.html

and http://www.cfd-online.com/Forums/ans...here-cube.html

thank you so much ...

[Far]

Few snapshots for your case (you have fluid and solid regions ?)

[malay]

Originally Posted by Far

Few snapshots for your case (you have fluid and solid regions ?)

yes i have fluid and solid regions ....

thanks bro

[malay]

when i finish making mesh by ICEM with fluid and solid i read it by fluent , but in fluent only one zone appear ( solid ) why ???

[Far]

Because you don't have the fluid region!!!

Right click on the parts then choose the last option (blocks). Rename to fluid and select the fluid blocks (blocks in Y-grid). Recreate premesh and convert to mesh. After that export the mesh and import into Fluent. You are done.

[malay]

Originally Posted by Far

Because you don't have the fluid region!!!

Right click on the parts then choose the last option (blocks). Rename to fluid and select the fluid blocks (blocks in Y-grid). Recreate premesh and convert to mesh. After that export the mesh and import into Fluent. You are done.

really i thank you so much ..... i get it

[Far]

Originally Posted by malay

I did this blocks but the mesh quality appeared poor , especially at the corner of triangular prism ...

When you have the triangular prisms, dont compare their quality to hexa. With prism, quality of 0.01 is also good enough

Here I am quoting one of the Simon's post regarding quality. http://www.cfd-online.com/Forums/ans...rism-mesh.html post # 15

If you haven't seen the inverted issue, then no worries... It happens only in 13.0 for redistribute prism, but is already fixed... In the mean time, the work around is to redistribute using the "Move => Redistribute Prisms" command. There isn't any more to tell.

Min tetra quality should probably be above 0.2, but if you have some below, it is probably fine, particularly in a non critical area. CFX is pretty robust, you could try as low as 0.05.

The Prism metric is really harsh in ICEM CFD. If you can get above 0.01, it will probably run fine in CFX... You could even go lower. (Maybe others can comment on their worst mesh that converged)...

Hexa, you are usually looking at min angle and aspect ratio... We shoot for an angle over 18, but will take anything over 9.