Frequently Asked Questions
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While we've tried to anticipate your questions here, I doubt we've got all of them covered. If you have a question that you want a timely answer to, then consider posting it in our Forum.
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Want to create and store geometry? error.
Hello,
I cant get ''geometry'' and ''physics''. I get the error: Want to simulate gas and liquid flow? or Want to create and store geometry?. How can I get this right???
You Need to Activate an Add-on
The initial installation of Caedium acts as a viewer until you activate either a free trial or a paid subscription product add-on.
For a free 30-day trial of our Caedium Professional add-on (which will populate the Geometry and Physics Tool Palettes):
Inventor Files
Does Caedium import Autodesk Inventor files? How?
Use STEP (.stp) export in Inventor
I believe Inventor exports to STEP (.stp), which Caedium can then import using File->Import
Pressure Boundary Conditions
How can one set pressure boundary conditions where a geometry has multiple inlets and a fixed outlet flow rate?
Physics:Inlet->Type = Pressure
Drag and drop the Conditions->Inlet tool from the Physics Tool Palette onto your inlets, in the Properties Panel set the Physics:Inlet->Type = Pressure, then set the p/rho property = Pressure
multiple windows
Can't get this working - - I have a gemetry in one window and residuals in another. Tried the directions of dragging residuals onto white next to geometry and window doesn't go side-by-side.
What am I missing?
Should see a transparent blue rectangle
When you get close to a valid position for the window you are dragging you should see a transparent blue rectangle indicating the region the window will fill - that's the moment to release the mouse.
CAEDIUM on Windows HPC R2
Hello,
I'm trying to test parallel function of CAEDIUM. All parameters are configured as on line documentation but run fail with this message :
"Warning:
RANS Flow failed
Unexpected process exit.
Aucune connexion n'a pu être établie car l'ordinateur cible l'a expressément refusée 127.0.0.1:5800"
Of course my firewall is deactivated.
Any idea ?
K. LOUESLATI
No connection could be made...
Translates to "No connection could be made because the target machine actively refused it"
I have not seen this error before. My guess is that it has something to do with the setup of your WIndows HPC Server.
So I'd just check again your settings with "Microsoft Windows HPC Server 2008 Cluster Configuration."
Some ideas:
Final option would be to try "Windows HPC (High Performance Computing) Forums" or the French equivalent.
Windows HPC Server Errors
Another idea, suggested by a contact at Microsoft - try running the Tests->System->MPI Performance tests (e.g., MPI Ping-Pong: Latency) under the Diagnostics group in the HPC Cluster Manager.
RANS Flow error
When I try to run de project, a RANS Flow error appears
"Warning:
volume_5 [www.1452.5] RANS Flow: Failed
Solver singularity: Exec : simpleFoam -case "
Can anyone help me?
Likely a mesh problem
It would help if you described what you are trying to simulate and how you constructed (import format?) your geometry.
When a simulation fails, 90% of the time it's related to mesh problems. For more details see the comment "Mesh Diagnostics".
Also the Substance->Solver->Turbulence Model = K-Omega SST tends to be more robust than K-E.
questions on 64 bit version
I am trialing the 64 bit version and it looks promising, but i have a few questions:
1. does Caedium support import of Google sketchUp files? DAE or KMZ format?
2. We are interested in RANS applications and need to assess mixing: either by using a thermal transport or scalar transport equation. If we use the energy equation what is the best way to decouple energy from the flow solution. If we try a scalar transport (possible?) can you reccomend an approach.
Caedium can import Google SketchUp Models
In answer to your questions:
1) Yes Caedium Professional can import COLLADA files (.dae) exported by Google SketchUp. However, you will need to specially configure those models to be water tight, i.e., all edges shared by 2 faces.
2) To solve for thermal transport use the Substance->State>Heat Transfer = On, Compressible = No and then once you've added the Substance to your flow volume set Substance->Properties->Reference->g (gravity) = [0 0 0]. Caedium does not support scalar transport.
?'s caedium output
I am trying to learn the ropes with Caedium and have several questions.
1. Is there a file or output summary that documents the material balances? I am interested in the massflow at each inlet/oulet and the net, as well as energy, etc. Can these be obtained from the open foam files?
2. Caedium produces pressure output on faces. Is there a tool to get an area weigted average to determine load? (Anumerical value is preferred not just a graphical value)
3.Is there a summary of what graphical output is being used. For example I might set up an example and showing velocity magnitude colored, and particle traces from one of several inlets. Is there a summary identifying options used in the volume and at faces. Another user would prefer a summary to simplify understanding of the case.
Create new Caedium Results
In general it seems you will need to create new Caedium Results as demonstrated in the tutorial "Fluid Flow Around a Sphere: Theory Comparison". Then create the associated Plots or Monitors and export the values as Comma Separated Values (CSV).
Specifically in answer to your questions:
1) Yes, create a new Result massflow = Sum(U.Mag * A * rho), where rho is a constant equal to your incompressible density.
2) Yes, create a new Result pAvg= Sum(p * A) / Sum(A), or if you want the load (Force) just use the existing Result Vector Variables->F.
3) The View Legend provides a summary of the visualization used, e.g., Color Map + range and Arrows. When you export the view as an image the legend summarizes this info. The View properties associated with an entity are the primary means to review your visualization settings.
For a summary of the geometry, mesh and physics on entities (e.g., volume, faces) try the Other->Info tool on the Geometry Tool Palette. This will produce a report in the File->Log.
thx for the prompt response
thx for the prompt response
importing a dae file
I have a dae file from sketchup and am trying to import. doesn't look like the Caedium version I have supports that extension. Advice?
Caedium Professional and Exchange for COLLADA import
COLLADA import is supported by the Caedium add-ons:
geometry question
I am evalutaing this software and have many geometries that may require inputting vertices, then creating faces then joining faces to make a geometry.
It is easy enough to input a vertex. Is there a tutorial in how to create a face and then join faces into volumes?
geometry question
if one inputs vertices how do you display the (x,y,z) on the viewing field?
it is difficult otherwise to know where a box or geometry is located.
Loft and Stitch
Before you can create faces you'll need to create edges using the Edges->Spline tool on the Geometry Tool Palette. If you have just two vertices then the Spline tool will join them with a straight line. You can create the vertices directly in Caedium or you can import points as a single column of X Y Z coordinates - leave a blank line to segment the vertices into groups. For more details see the comment "Import Airfoils as Points".
You can either use the Faces->Loft (more robust) or Stitch tools to create faces from edges and then use the Volumes->Stitch tool to create a volume from faces. For more details see the tutorial "Loft and Stitch".
Multiple Cameras
There's no in-camera view of the coordinates.
I suggest creating multiple cameras of the same view, using File->New->Camera and then manipulate each camera to be helpful.
Another option would be to create a box or rectangle grid as a reference.