[morteza08]

hi all
does anybody know how can i find a tutorial for modeling a impingement jet in gambit
something like this for flow around sphere
https://confluence.cornell.edu/displ...phere+-+Step+1

a picture is attached that is what i am going to model(3d model)

[-mAx-]

your geometry isn't complicated...
Create your outter domain, your pipe, the cube.
Place them where you want.
Finally substract the pipe and the cube from the outter domain.
From here you can start meshing.

[morteza08]

Originally Posted by -mAx-

your geometry isn't complicated...
Create your outter domain, your pipe, the cube.
Place them where you want.
Finally substract the pipe and the cube from the outter domain.
From here you can start meshing.

dear friend..thanks for your reply
i created the geometry ... i only created the volumes and placed them in their order... i do not know how can i split,merge,unite,subtract or ... volumes...
by the way i want to create structured mesh and makes my work complicated ..
i have to create multiple volumes to have structured mesh..
i sent the photo of my geometry and a dbs file ... take a look plz and help me more

[-mAx-]

how should your outer domain look like? (domain where your flow is free to move)

[morteza08]

Originally Posted by -mAx-

how should your outer domain look like? (domain where your flow is free to move)

the pedestal is cubic in one case and cylindrical in the other case...
in this case it is cubic... i design the outer domain like a cube... this big cube is created from 3 smaller cube...

[-mAx-]

ok and what is the volume under the cylinder?

[morteza08]

Originally Posted by -mAx-

ok and what is the volume under the cylinder?

since the distance between jet and pedestal is relatively large.. i thouth if i assign a smaller volume for spaces near jet it saved time by reducing the number of cells..
instead i extend the outer volume near surface that is flow features is more important

[-mAx-]

ok
*split jet_cylinder with cube adjacent to jet
*substract near pedestral with pedestral (new volume called near pedestral)
*split v1 with v2
*split v2 with v3
*split v1 with near pedestral (new volume called volume11)
*split v2 with near pedestral (new volume called volume13)
*split v3 with near pedestral (new volume called volume16)
*delete volume16
*split volume cube adjacent to jet with v1 and v11
That's it

PS: Since you will hexa, I would create cylinders instead of bricks (except the pedestral of course)

[morteza08]

Originally Posted by -mAx-

ok
*split jet_cylinder with cube adjacent to jet
*substract near pedestral with pedestral (new volume called near pedestral)
*split v1 with v2
*split v2 with v3
*split v1 with near pedestral (new volume called volume11)
*split v2 with near pedestral (new volume called volume13)
*split v3 with near pedestral (new volume called volume16)
*delete volume16
*split volume cube adjacent to jet with v1 and v11
That's it

PS: Since you will hexa, I would create cylinders instead of bricks (except the pedestral of course)

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thank u...
it was helpful.
but what dy u mean of this:
Since you will hexa, I would create cylinders instead of bricks (except the pedestral of course

[-mAx-]

mesh your modell with hexa you will understand

[morteza08]

Originally Posted by -mAx-

mesh your modell with hexa you will understand

thank you very much

[morteza08]

Originally Posted by -mAx-

mesh your modell with hexa you will understand

Hi dear friend
your previous guidance helped me very much...
I have also some basic problems in gambit modeling . It's my pleasure if you can help me ...
I am modelling different cases in 3d environment.
to create a structured grid I designed so many volumes... some of them is small volumes and are located in other bigger volumes. and some of them intersect each other.. and some of there are adjacent volumes.
My problem is in splitting and subtracting volumes... I don't know when i have to split volumes, when i have to subtract them. and other operations...
I couldn't find any useful instruction on the web...
for example I couldn't find why did you tell me that instruction for .dbs file for 3d impingement jet..
please help me... I have to prepare my projects , but i have also problems here

thanks

[-mAx-]

http://my.fit.edu/itresources/manuals/gambit2.3/help/