[openfoammaofnepo]

Dear All,

I would like to generate a curve and then rotate this curve to generate a surface with ICEM. I know the function of this curve but I do not know where I can input this function in ICEM. My geometry is axis-symmetric. Does anybody know how to do this with ICEM?

Thank you in advance !
OFFO

[Nat Sam]

Hi

So you know how to draw a curve right ? What you don't know is how to generate a surface that rotates ?

You need a curve and an axis around which this curve would rotate to generate the surface

Geometry -> Create / Modify Surface -> Surface of Revolution


Nat

[openfoammaofnepo]

hi Nat,

thank you. my question is about how to generate a curve based on a known function, like a power function. do you know how to do this ?

The function is as follows:

r(x)=-18*x^3 + 6.4*x^2 + 0.1, where x is the streamwise coordinate.

Originally Posted by Nat Sam

Hi

So you know how to draw a curve right ? What you don't know is how to generate a surface that rotates ?

You need a curve and an axis around which this curve would rotate to generate the surface

Geometry -> Create / Modify Surface -> Surface of Revolution


Nat

[Nat Sam]

Oh sorry I didn't uderstand that at all. Thought I was helping you x)
I'm afraid I do not know how to do that on ICEM. If you know how to use a CAD software like CATIA, I suggest you draw you geometry using that. That's what I did (currently doing an internship using ICEM)...

Hope someone can help you soon !

Nat

[openfoammaofnepo]

Thank you all the same!

Originally Posted by Nat Sam

Oh sorry I didn't uderstand that at all. Thought I was helping you x)
I'm afraid I do not know how to do that on ICEM. If you know how to use a CAD software like CATIA, I suggest you draw you geometry using that. That's what I did (currently doing an internship using ICEM)...

Hope someone can help you soon !

Nat

[Far]

i don think you can use function in ICEM CFD. You can use excel to get coordinates and take them to ICEM CFD. Then revolve it in ICEM CFD to get surface.

[openfoammaofnepo]

No. We can generate the point with the functions and then connect these point to generate the curves. It can work.

Originally Posted by Far

i don think you can use function in ICEM CFD. You can use excel to get coordinates and take them to ICEM CFD. Then revolve it in ICEM CFD to get surface.

[bluebase]

Originally Posted by openfoammaofnepo

No. We can generate the point with the functions and then connect these point to generate the curves. It can work.

Well... do you know how or not...?

Do you know about the replay function of icem? Yes? Then you should also know, that icem scripts are in tcl language. Have a look at some tutorials on that language in case you never heard of tcl.

To give you an idea how to do it, i have prepared a short script for you. i guess, it is already more than i should help! Save it into a text file with *.tcl ending and run it with icem.

With regards,
Sebastian



(Little 'homework'... try to figure out how to connect all those points with a script)

set steps 100.

set xmin 0.0
set xmax 0.1

set crvlgh [expr $xmax-$xmin]
set steplgh [expr $crvlgh/$steps ]

for {set n 0} {$n <= $steps } {incr n} {
  set xvalue [expr $n*$steplgh + $xmin]
  set functionvalue [expr -18.*pow($xvalue,3.) + 6.4*pow($xvalue,2.) + 0.1]

  ic_point {} PARTNAME pointname.$n "$xvalue,$functionvalue,0" 

}

[bluebase]

There was an error in my calculation. I edited it. Now it should work flawlessly.

[Far]

Excellent work.....