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Old   September 7, 2010, 05:13
Default Very slow response from DesignModeler in Ansys Workbench 2.0
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Hi guys!

Hope someone can help me out with this one:

I've been making a relatively simple geometry using DesignModeler. It is essentially a matrix of equally sized rectangles and each rectangle has within it another rectangle. In total there are about 250 to 300 rectangles. All this is in Sketch mode (so in 2D). Contraints like "Coincident", "Equal Length" and "Equal distance" were used to align all the rectangles in an orderly fashion.

The problem is that as the number of rectangles increased (reached approximately 200+) the DesignModeler started responding extremely slowly in that, whenever I would change a dimension of a rectangle, or create a new one, it would take upto 2 mins for it to show up. This makes it impossible for me to finish the project (for which I have to modify all 250+ rectangles).

At first sight, one may think that my pc has reached its processing limit. But I tried carrying out this project on a pc with 24GB of RAM and 8 intel i7 processors. The problem persisted.

It really isn't a problem at the hardware level.

Does anyone have a clue??

Thanks for reading ! Hope someone can help !
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Old   September 17, 2010, 17:13
Andy Jones
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I see you are using Windows. If it is a 32 bit version of Windows, you can only use about 3.4 Gb of ram irreguardless of what is installed. On a 64 bit Windows 7 system, there is no ram limitation to speak of..maybe 168 Gb or something .
That model looked HUGE!

The amount of ram in your video card is important. If you have a SLI slots, you can run more than one video card. You might be able to do that with a PCIe card also, or maybe a PCI card. But SLI for sure allows more than one card to multitask the video card problem. Video cards are a usual system bottleneck. If you are able to multitask video cards, I would buy one more.

You should be running the Microsoft Net Framework 4.0 , and be using the Visual Studio 2010 C++ runtime. Both are available in the redistributable package.

You could reduce your screen resolution to 1024 x 768, or 800 x 600 to see if it will run.

There is software available to allow parallel computing. It would require some effort to install and configure, then you could add a second computer to multitask the problem between two machines (if all else fails).
Update Windows, update your video card drivers, ethernet drivers, DVD drive drivers. Run disk cleanup, Defrag your hard drive.
I tried loading a 1 Gb CAD file one time with a 256 mb video card and it locked the machine and blue screened.
Many of the large models are being run on Linux clusters. You can do similar things with Windows with the right software.
In the future, you could consider a Solid state Hard drive for the operating system and 10,000 rpm Sata 3 or Sata 6 hard drives in a RAID config for the programs, or maybe RAID on the Operating system as well.

You need to know what your video card temperature is as well as your cpu temperature, as this can hang an application. I would suggest PCwizard 2009 by CPUID. Its free and will benchmark your system to confirm correct operation and allows comparison with similar machines. Look at your power supply voltages also, as this can cause problems..pcwizard checks this too...You should be within 5-10% of 12V, 5V, 3.3V.

If Ansys is using GL, you should have opencascade GL libraries or something similar installed....(what is Ansys using to generate mesh )..Do you have the latest complete libraries installed for mesh generation? Find out what dependencies Ansys (mesh generation, CAD model dependencies) has and make sure you have the latest full versions installed If you are using an Academic version of Ansys, does it limit the size of anything since its an academic version?

Are you trying to render in realtime? Maybe let the system render after building the model.

How many colors are you trying to use to render? You can cut back the number of colors from 16 million to 16,000..that might help.

Do you need any additional math libaries installed, such as the Intel math library?

Install the latest Java. Consider installing Java 3D. Install the latest Adobe shockwave. You should have Net Framework 1.1, 2.0, 3.0, 4.0 installed. Install Visual Studio Express C++ (if its a 32 bit system) to give your machine a compiler if it somehow needs one. If its a 64 bit system use Visual Studio 2005 standard or Professional. Run antivirus, run adaware. Check your Registry for errors with a Registry Optimizer. Update your monitor driver. Buy a fast USB memory stick and use it as ready boost to see if that helps. Add ram if you can.

Check Device Manager for errors and right click My Computer and select manage, then go to application logs and system logs and see what it says about the problem.

What are the specs of your computer? cpu, ram, video? OS? Many of these CAD models and CFD models you see were built by Supercomputers or Linux Clusters.
good luck!!
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Old   October 5, 2010, 09:32
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Mark Summers
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I am using Windows 7, and am unable to install version 2 SP1 of Microsoft .NET Framework. When I launch DesignModeler from inside Workbench by selecting the "New Geometry" option, after waiting a minute or two, all I get is a blank gray screen. Any ideas would be appreciated. I have an HP nw9440 laptop with 3GB RAM, and an NVIDIA 1500M video card.
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design modeler, performance, sketch, slow

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