[Virtual-sim] Issues and dxf?

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Erik Eriksson's picture
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Hi,
yes dxf files can be imported in VE and can save tons of time in drawing the building. Please take the following steps before you import any dxf into VE:

* Remove in dxf file everything except: walls,windows, doors and labels
* When you are importing the dxf. make sure, that the appropriate scale has been input.
* The trick to find out scale of the drawing is, to measure a door, typically a single door is 1m, now let say the measurement comes upto be 10m it means its 1:10 scale. etc

The calculation of VE is reliable. Only that the dynamic calculation gives us actualy true loads which some times differ from ASHRAE loads. The reason is ASHRAE does all its loads on a particualr design day. Whereas VE picks up the worse case scanario for the building. VE also has the capability to somply calculate ASHRAE loads.

Best Regards;
Ali Nouman Khan

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Erik Eriksson's picture
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Hi Erik

Presently I am working on the Microflo module of IES VE for a CFD analysis. What kind of help u need??

Manjinder Singh

Mechanical Engineer | Professional Services Portfolio | Project Services

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Level 5B 80 George Street,

Brisbane, Queensland 4000

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I am currently trying to use MicroFlo to run an external CFD on a building.
The CFD grid statistics window shows I have twice the memory (both physical
and virtual) needed to run the simulation. However, when I go to run the
analysis I get a pop up dialog saying out of memory and the program freezes
while generating the grid. I am using MicroFlo for the first time and
welcome any help.

Regards,

Eric Dixon, EIT, LEED AP
Mechanical Engineer

BURT HILL
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The Green Community ? Phase 1
P.O. Box 52764
Dubai, United Arab Emirates
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Erik Eriksson
ite.se> To
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Subject
03/03/2009 12:53 Re: [Virtual-sim] Issues and dxf?
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Hi Manjinder,

I tested it for a couple of years ago and my experience was that it was
very easy to use. That is normally a good thing, but when it comes to CFD
programs they tend to be very complicated and I just figured that MicroFlo
therefore couldnt be that accurate in its results.

We are looking into it again and I think its brilliant that its so simple,
but the results need to be accurate (obviously).
Have you found the accuracy in the results doubtful?

Best regards

E r i k E r i k s s o n

Energy specialist and project manager
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White project & environmental management

Box 4700
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Eric.Dixon at burthill.com's picture
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Hi Erik

There are couple of suggestions while using the Microflo module of IES.

1. While importing the dxf file into IES, the dxf file should be clear, I mean to say to be a single line file as to avoid picking the points close to one another.
2. Try to use the grid for the point selection not the end point. As while using the program you can find a difference that while picking up a end point there could be a small variation in the point which will result in a very narrow grid and which will increase the no. of cells and that could led to a problem of the memory and also the convergence will not be achieved and end up with inappropriate results.
3. IES is simple to use for CFD as it works very well if we have a Maximum aspect ratio <10:1
4. IES is having a problem, it can't do the internal and external simulation at one instance (in a single go), where as the programs like Phoenics (CHAM software) can do it in one go.

May be these points help you in achieving the right results.

Regards

Manjinder Singh

Mechanical Engineer | Professional Services Portfolio | Project Services

-----------------------------------------------------------------------------------------

Level 5B 80 George Street,

Brisbane, Queensland 4000

T: (07) 3227 8064 | F: (07) 3224 6151

E: Manjinder.Singh at projectservices.qld.gov.au | Web: www.projectservices.qld.gov.au

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A couple of things to add to this:

Here are some notes for dxf use:

Explode all blocks ? this allows text to come into VE properly

Delete all unnecessary layers and purge the drawing

Copy to new drawing as a block and paste/set origin at 0,0 otherwise you?ll
end up with graphics issues when the origin is a long way from 0,0.

You can also draw a single line on a new layer and then just use that layer
to create the model ? this should allow construct-dxf to work.

For Microflo use:

Keep it simple.

Try not to play with the grid too much as although in theory this should be
better, invariably it makes things worse.

Try and use a grid and snap to it to set the model up in the first place so
you don?t end up with lots of small slithers of grid.

If it?s a complicated project, it probably needs a complicated CFD tool.

Regards

Paul

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