Star Ccm Problem
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Transcript of Star Ccm Problem
1. Drawing geometry in rhinoceros
For describing my problem, this time I use very simple geometry that is consist of only flat
surfaces.
2. Drawing domain box
Once I am satisfied with my domain box I trim the surface in symmetry plane and join all
surfaces. In property window we see the type of geometry (closed polysurface), that shuld be
insurance that there is no leaks. File/export selected and choose parasolid .x_t, and gemoetry is
ready for star-ccm+
3. Importing surface mesh
Start a new simulation File/New Simulation/ Ok
Import geometry CAD File/Import Surface Mesh/simple.x_t/ Ok
In import surface options dialog I choose
-create new region
-one boundary per face
-one region per body
The imported geometry look like in the picture below
4. Rename and combine boundaries
I hold ctrl and select all surfaces that represent hull and right mouse button (RC), then click
combine
The bounduries is now order and rename as shown in the picture below. In property window
type of the boundaries is changed in:
In: velocity Inlet
Out: Pressure Outlet
Sym: Symmetry Plane
5. Make a new Mesh Scene and select meshing models
Scenes / RC New Scene / Mesh
Continua,RC / Mesh1 / Select Meshing models
6. First Meshing test using resurfacer
Click this icon the begin surface meshing
Click and drag the selected item onto the open Mesh 1 Scene on the right to view the surface
mesh
Mesh looks little unnecessary fine. I want to keep mesh fine close to boat and little bit rougher
far from the boat , so I go:
Continua / Mesh1 / Reference Values / Base Size / 5 m
Region 1/ 0-hull / Mesh condition / custom surface size , select (properties)
Region 1/ 0-hull / Mesh Values/ Surface size / Target .. 12% , min ..12%
Region 1/ 0-deck/ Mesh condition / custom surface size , select (properties)
Region 1/ 0-deck/ Mesh Values/ Surface size / Target .. 25% , min ..25%
7. Creating block tools
Tools/ volume shapes/ RC new shape / Block
…and choose as below
8. Anisotropic and mesh align
Continua/ Mesh 1/ volumetric controls / RC new , then click on VolContr 1. In the property
windows click on the square brackets [], choose the “block1” shape as below
Mesh conditions / Trimmer / PW check isotropic and anisotropic
Mesh Values/ Custom size / 50 %
Trimmer anisotropic / PW choose Z / Relative Z size 12 %
Mesh 1 / Trimmer / PW / Check Do mesh alignment
Mesh 1 / Reference Values / Mesh alignment location / leave 0,0,0
9. Volume meshing
Click this icon the start volume meshing
Click on empy part of mesh scene, RC / Apply representation / Volume
10. Creating block tools
Create a second block in front of the boat and a third refinement around the boat
-second block
-third block
Add a second volumetric control with “block2” as input, and 6% anisotropic only mesh size
Add a third volumetric control with 12% isotropic only size
11. Add a wall layer and regenerate Mesh
Continua/ Mesh1/ RC select Meshing models , pick “prism layer mesher”
Continua/ Mesh1/ Reference values / Prism L. Thickness ... 6 %
Continua/ Mesh1/ Reference values / Number of prism layers ... 3
Regenerete mesh we see bellow
12. Physics setup 1
Continua/ physics1/ RC select models
13. Physics setup 2
Continua/ Physics1/ models / Eulerian Multiphase ( Eleurian Phases / RC new (2 times )
Phase 1 / models / RC select models /“Gas”/Constant Density
Phase 2 / models / RC select models /“Liquid” / Constant Density
14. Physics setup 3
Specifiy inlet velocity :
Physics conditions / Flow direction./PW, Method Components
Physics Values / Flow Direction / PW : Value -1 ,0,0
Physics Values / Velocity magnitude : PW : 5.0 m/s
Specifiy initial velocity vector field
Physics 1 / Initial Conditions / Velocity / [-5.0 ,0.0 ,0.0]
15. VOF setup
Continua/ physics1/ RC select models
Select VOF Waves
Continua/ physics1/ models/ VOF Waves /Waves/ (RC) New/ Flat
16. Make a new scalar scene
Scenes / RC new / Scalar
Click & drag “sym” boundary onto scene window / “add to Scalar 1
17. Visualising functions
Obviously this does not work
I should see something like
this: