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Problem: Start Simulation

oliver.frahnert
Contributor

Problem: Start Simulation

oliver.frahnert
Contributor
Contributor

Hello Guys,

when i want to run the simulation, the program tells me following:

Network file cannot be written.

Check if a problem occurred during mesh generation and fix existing geometry errors if necessary.

I followed the steps under fourther information. but this doesnt seem to help.
My model and mesh is shown here:

oliverfrahnert_0-1690485344756.png

Someone have an idea?

I added the model directly with the button in fusion 360 and didnt export and import it.




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Accepted solutions (1)
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marwan_azzam
Alumni
Alumni

Where's the model saved?

 

Marwan

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oliver.frahnert
Contributor
Contributor
Hey Marwan,

i saved the model (the CAD Model from fusion) in the fusion cloud

greetings
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marwan_azzam
Alumni
Alumni

Don't.

Save it on local drive.

 

Marwan

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oliver.frahnert
Contributor
Contributor
i will try, because first i tried it with a simple exported model and with that it worked
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oliver.frahnert
Contributor
Contributor

Hey Marwan,
i tried it again with an imported modell and it still throws the same error message.

 

I think the information for the mesh also doesnt look right.

oliverfrahnert_0-1690489778345.png

 

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oliver.frahnert
Contributor
Contributor

Also this looks as too much for me:

oliverfrahnert_0-1690489921989.png

 

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marwan_azzam
Alumni
Alumni

@oliver.frahnert ,

 

Does the model mesh fine?

Can you share the CFD model?

 

Marwan

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oliver.frahnert
Contributor
Contributor

Yes the model meshes fine. Where do i find the model file, because the path wich is named in the Design 1_model.txt is missleading.

 

oliverfrahnert_1-1690491326671.png

 

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marwan_azzam
Alumni
Alumni

Create the support share file (*.cfz)

zip the cfz file

Post the zip file

 

Marwan

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oliver.frahnert
Contributor
Contributor

I try but the forum sends this message:

Correct the marked errors and try again afterwards.

The content type (application/octet-stream) of the attachment thermal-simulation.cfz does not match its file extension and has been removed.

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marwan_azzam
Alumni
Alumni

@oliver.frahnert ,

 

Good. You got 1 out of 3.

 

CFD_CFZ_ZIP.png

 

Let's shoot for 3 out of 3.

 

Marwan

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oliver.frahnert
Contributor
Contributor

Sorry total brain afk 😄 Here you go

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marwan_azzam
Alumni
Alumni

Hi @oliver.frahnert 

 

1- Simplify the geometry a bit (get rid of some of that details (slots) in the frame.

2- Rotating region is wrong. Get rid of parts 4, 6, & 22 and replace with a simple shape and make that an internal fan.

 

Marwan

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oliver.frahnert
Contributor
Contributor

To 1: 

oliverfrahnert_0-1690545919383.pngoliverfrahnert_1-1690545930649.png

With simplify you mean those tools? Or simplify the mesh? What should i do for second?


To 2: This needs to be done in fusion i assume? 

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marwan_azzam
Alumni
Alumni

@oliver.frahnert ,

 

All the changes should be done in Fusion.

 

Marwan

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oliver.frahnert
Contributor
Contributor

oliverfrahnert_0-1690551095362.png

Is this simple enough? I changed the aluprofiles and the isolation to squares and removed the fan and replaced it with a single round object. Is it really clever to replace the fan? Because then the simulation of the flowrate from the fan is not given. I wanted to make the fanblades rotating so the flowrate trough the fanholder gets simulated.

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marwan_azzam
Alumni
Alumni

@oliver.frahnert ,

 

This looks good.

You will set the material of that round object to Internal Fan and set the parameters you want. This will drive the flow.

 

Marwan

oliver.frahnert
Contributor
Contributor

Does not seem to help, i still get the same error.
There are also still 1.1M elements in the mesh. 😞
This is my new support file:

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marwan_azzam
Alumni
Alumni
Accepted solution

Hi @oliver.frahnert ,

 

It doesn't make sense for the part you define as a Heat Sink to be a heat sink.

Heat sinks are usually in contact with a solid at the bottom and with air on the top with no parts attached to the top.

If you change that part to a Solid the analysis will start running.

 

Marwan

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