can not generate the mesh

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  • Last Post 12 November 2018
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justnarendra posted this 23 October 2018

hello ansys world 

i want to do the aerodynamic simulation of car model in ansys fluent but i am not able to creat the mesh. 

please find the STEP file with this post and let me know what steps should follow. 

many thanks in advance 

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kkanade posted this 23 October 2018

Hi, 

Can you please insert images. As ANSYS employee, we can not download attachments. 

Also please have a look at following video which can help you to mesh. 

Regards,

Keyur

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justnarendra posted this 23 October 2018

hi . soon i will upload the pics but at the moment i am not able to see the video link 

justnarendra posted this 23 October 2018

https://grabcad.com/library/the-lamborghini-terzo-millennio-concept-car-1 this is the link of the step file from grab cad 

Kremella posted this 23 October 2018

Hello,

Here are some video related to meshing a car using Workbench meshing.

Please see if you can use them to learn how to mesh. Also, as per Keyur's suggestions, please share some more details about your geometry and we can provide more specific instructions.

Thank you.

Best Regards,

Karthik

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kkanade posted this 23 October 2018

Thanks Karthik, I forgot to share link for video. 

justnarendra posted this 24 October 2018

hi here are some screenshots please let me know how should i proceed 

justnarendra posted this 24 October 2018

please find the geometry above

justnarendra posted this 24 October 2018

please find the geometry above

rwoolhou posted this 24 October 2018

Hard to tell but it looks like you've got a volume and the car is a collection of surface bodies. This will mesh, but possibly not as you intend. Also, if you read the error message I think (hard to read) that you've got some poor surface cells. Have a look at the surfaces and do some clean up. 

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justnarendra posted this 24 October 2018

justnarendra posted this 24 October 2018

do i need to close the car body and what about the contacts ?

rwoolhou posted this 24 October 2018

Depends on what you're trying to achieve: Cars tend to be closed (unless they're convertibles) and contacts means you didn't create multibody parts. 

Looking through the errors, line two is the most useful: have you got very small faces on the car or sharp angles on the surfaces?

justnarendra posted this 24 October 2018

this geometry has 18 parts which are small and few are large as well and 40 contact regions 

justnarendra posted this 24 October 2018

https://grabcad.com/library/audi-r8-mesh-2d-1 is the link of the geometry 

kkanade posted this 24 October 2018

Hello, 

If you want aerodynamic study as shown in video, please create a solid out of surfaces. Then create outer domain and use subtraction to get fluid domain. 

Please try to start with simple shape as shown in the video. Get familiar with the procedure. Then use your geometry. 

Regards,

Keyur

justnarendra posted this 25 October 2018

the mesher did not generate any nodes what does it mean ? and tried but i am not able to generate solid out of surfaces any tutorial which might help me ?

rwoolhou posted this 25 October 2018

Have a look at the surfaces and see if they create a sealed volume: assuming they don't what do you need to do to close it?  I doubt there is a specific tutorial, but have a look at the DesignModeler examples. 

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justnarendra posted this 25 October 2018

thanks

kkanade posted this 25 October 2018

Hi, 

For closing that car body, you may need to create some more faces so that it can have a closed region. After than please use body operations - stitch command in DM to create solid body.

Regards,

Keyur

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kkanade posted this 25 October 2018

Sorry, its 'sew' and not stitch. 

Regards,

Keyur

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justnarendra posted this 25 October 2018

thanks keyur

justnarendra posted this 25 October 2018

Operation would result in non-manifold bodies i am getting this error.   i closed all the bodies but still i am not able to creat boolean 

kkanade posted this 25 October 2018

Did you get a solid in model tree?

Go to tools -- analysis tools -- fault detection. Check if geometry has any faults. 

Regards,

Keyur

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justnarendra posted this 25 October 2018

justnarendra posted this 26 October 2018

please take a look ...

kkanade posted this 29 October 2018

Use Create - Thin Surface and faces except the faces which are giving problem of self intersection. Use thickeness of zero. 

Then recreate those faces to patch the hole. Then again use sew command to create solid. 

Regards,

Keyur

justnarendra posted this 30 October 2018

hi Keyur as u said i am using very simple geometry at this time but still i am not able to creat the domain please take a look again and there is no fault in the geometry

kkanade posted this 31 October 2018

From images, it is still a surface body. Please use sew operation only for surfaces. Please suppress line bodies. 

Regards,

Keyur

justnarendra posted this 31 October 2018

justnarendra posted this 31 October 2018

still i am not able to creat thin surface

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