Thermal Analysis using Hypermesh [Optistruct Tutorial]

In this Optistruct tutorial, we will perform a steady state thermal analysis using Hypermesh. This will involve the creation of conduction and convection interfaces as well as thermal contacts.
CAD Model Link : drive.google.c...
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[@user-co8ji5xy1h]

very helpful

[@emmanuelvassilakis5630]

Hi Swapnil! Long time to talk! Your presentation was excellent! When do you plan to present the heated bore - interference fit coupled analysis that we have discussed in previous conversations? Tell me if I can help.

[@Aeroswap]

Hey Emmanuel, thanks! Right, I should start working on it now! All prerequisites for that analysis are covered through other videos already :) I will send you an email soon. Let's discuss this!

[@emmanuelvassilakis5630]

@@Aeroswap Sure! I'll be happy to discuss it. One "silly" question since I am no expert in heat transfer modeling within the HM environment although it's never too late to start using it :) Your ambient temperature load collector is for denoting that both your parts are at an initial temp of 15 degrees Celsius? Isn't there another way to define this condition (i.e. the MAT card)? Thank you in advance for your reply.

[@Aeroswap]

Good question! The ambient temperature loadcollector does not set the global temperature. It is only applicable for the convection interface. By default, the solver sets global temperature to 0 (unit as per the model setup). If we want to change this global temperature to some other value, a control card has to be added - 'UNDEFTEMP'. This card can be used to set a global temperature value in all regions where we have not assigned a temperature manually. I hope this is what you wanted to know!

[@emmanuelvassilakis5630]

@@Aeroswap Thank you very much for the clarification Swapnil!

[@stefaniamagnettigisolo5775]

Hello! please can I ask a question? if I am supposed to apply a thermal load on some nodes, which is the default/room temperature assumed, 25°C perhaps? And the value entered as thermal load is the temperature assigned to the node or the veriation with respect to the room temperature? thank you

[@Aeroswap]

If you apply temperature to a node, it is not room temperature. It is a temperature load at that location with respect to the ambient temperature, which is 0 by default.

[@stefaniamagnettigisolo5775]

@@Aeroswap alright, as I suspected, thank you very much! and could you confirm that the way to apply this thermal load is to add the option 'TEMP2 in the card Loadstep? and if so, how do i can change the default temperature to be 25°C for instance?

[@Aeroswap]

To change the default temperature, you can add the control card 'UNDEFTEMP'. This will set the specified temperature value at all grid pionts in the model where temperature loads are not applied.

[@ramcharanreddynandikonda5820]

Hi can give access or share again CAD model link

[@NibishMathew]

Could you pls send me the file for geometry. When I Tried clicking the link mentioned in description its showing not available. Please Help. @Aeroswap

[@geoffreyrobeau6642]

Hello, I have some questions: 1. How can I manage convection if I have an assemble that is meshed with Hex and tetra ? do I have to create two groups, one for slave3 (tetra) and one for slave4 (hex) ? 2. In your model, only one part of surfaces is subjected to convection or flux load. So it means the most of your grid point have an initial state at 0°C right ? I guess that for a steady state study it doesn't have much influence but for a transient analysis isn't it better to change the default value or affect a load ? I don't know if I'm clear so I gonna explain myself with my concrete example. My goal is to see evolution of temperature node grid in an assemble that is placed in oven. For extern surfaces I use convection at the temperature of oven (and coefficient of forced convection). But my assemble has some free volumes inside; what should I do with them ? 3. Does the localisation of the temperature point is important ? Thanks alot in advance for your help and sorry for my english, it is maybe not that good..

[@Aeroswap]

Hi Geoffrey, Here are my comments regarding the doubts you have listed. 1. You can have slave3 and slave4 in a single group. As long as the type is 'slave', there is no need to create separate groups. 2. Yes, in this case the default temperature is 0 degC. However, you can use the 'UNDEFTEMP' control card to change the default temperature to a non-zero value. This can be done in steady state as well as transient analysis. 3. Location of the temp node does not affect the. It can be located at any location on the model. The only purpose of that temp node is to link the ambient temperature to the components. Apart from that, it does not serve any specific function. Hence, the location does not matter. I created it near the pipe only because it is easy to do so! You may create it at any location you desire. I hope this answers all your questions :)

[@geoffreyrobeau6642]

@@Aeroswap thx alot for your answers, that will be helpful

[@Rajkumar-rx9uz]

That's a nice video.. I came to know basic inputs of thermal analysis but when I repeated your steps I came across an error stating that PCONTHT 3 0.1 SYNTAX ERROR ON THIS CARD IMAGE . how to get rid of those

[@vijayvijay-yp6hu]

Sir pls make an video for fatigue analysis

[@Aeroswap]

Thanks for the suggestion. I will work on this topic soon.

[@ashishedasseril9186]

How would you take the animation video of this analysis that i have seen in your LinkedIn profile, is there any option in hypermesh for taking animation

[@Aeroswap]

Yes, on the top of the graphics area, you will see several options to capture images as well as animation. This is what I use to generate the Linkedin posts!

[@saivijay5626]

hey bro In my problem there is no heat flux in case of heat flux they provide temp of 600 degrees and to find displacement and stresses my values are zero in scientific values are also zero i have seen ur engine block problem how can i over come that?

[@Aeroswap]

Please check the value of coefficient of thermal expansion 'A' in your setup. If this value is wrong, the coupled thermal structural analysis will not work.

[@saivijay5626]

@@Aeroswap how to get A thermal expansion value

[@Aeroswap]

You can easily find these values on any online material database.

[@saujanyagujar9136]

How to solve error syntax error found in data bulk pcontht card

[@stefaniamagnettigisolo5775]

Hello, can I ask an off topic question? to run Hypermesh correctly it's necessary to be always connected to Ethernet??

[@Aeroswap]

Depends on your license configuration. If you have a local license, it will run without internet connectivity. However, if your license is installed on a server, you will be required to stay connected to that server throughout your session.

[@stefaniamagnettigisolo5775]

@@Aeroswap thank you very much!

[@stefaniamagnettigisolo5775]

@@Aeroswap alright thank you very much! and there is the possibility to define a different thermal load on different nodes and specify both in LoadStep option TERM?

[@Aeroswap]

Yes, multiple loads can be combined using the 'LOADADD' card. Create a new loadcollector and change its card image to LOADADD. Now in the tabular data entry, we can select multiple separate loads to combine them. Use this LOADADD loadcollector while defining the loadstep!

[@girirajdk1420]

Hello bro I have a model I have probelm in meshing it in hypermesh Do you mind looking into it???? I can send u the file reply to this comment Also Can u please create a seperate videos fro different models meshing which are quite different( tricky or complex) that would be really helpful

[@Aeroswap]

Hey Giriraj, Please watch the meshing tutorials posted on this channel. Separate tutorials have been uploaded about 2D meshing, 3D tetrameshing as well as 3D solid map. These tutorials will cover all the basics you need to know to be able to mesh any geometry without difficulties. Good luck!

[@neelamsaikiran7975]

Sir how to overcome this error "OptiStruct ERROR: 1. A fatal error has occurred in your model. Please refer to the .out file to obtain more information on how to correct it."

[@Aeroswap]

The cause of the error is not stated in this error message. Please check the .OUT file for this analysis for more information. You will find the OUT file in the folder where you saved the model before run.

[@neelamsaikiran7975]

@@Aeroswap sir iam triad. But it showing same error

[@Aeroswap]

Please check the file carefully to see if there are any discrepancies in the mentioned text. I cannot suggest anything until the actual cause of the error is figured out!

[@neelamsaikiran7975]

OptiStruct defaults set from: install config file: C:/Program Files/Altair/2020-edu/hwsolvers/optistruct.cfg. NOTE # 9199 MSGLMT=STRICT is active, all messages will be printed. You can suppress some less important warning messages by use of MSGLMT=BRIEF or UNREF (in config file or in the input data). 3 PARAM(s) were set: COUPMASS,YES G, .06 WTMASS, .0026 NOTE # 1929 Created RAM scratch area: total size 10 MB. This is job 1 of 1 in collection ( 2021-06-07T17:39:04 ) created by: ( HM11.0 ) THE FOLLOWING ERROR MESSAGE WAS RETRIEVED FROM THE LICENSE SERVER Altair License Manager: License error Feature(s): GlobalZoneAP, HyperWorks, HWOptiStructFEA Error Code: 9 Error Description: Feature not found Feature: OptiStructFEA Error Code: 6 Error Description: [LOCAL] D:\altair_lic.dat - (Err: 9) Feature not found [LOCAL] C:/Program Files/Altair/2020-edu/security/altair_lic.dat - (Err: 6) Unable to read file License Path: C:/Program Files/Altair/2020-edu/hwdesktop\security\altair_lic.dat;D:\altair_lic.dat;C:/Program Files/Altair/2020-edu/security/altair_lic.dat THE FOLLOWING ERROR MESSAGE WAS RETRIEVED FROM THE LICENSE SERVER Altair License Manager: License error Feature(s): GlobalZoneAP, HyperWorks, HWOptiStruct Error Code: 9 Error Description: Feature not found Feature: OptiStruct Error Code: 6 Error Description: [LOCAL] D:\altair_lic.dat - (Err: 9) Feature not found [LOCAL] C:/Program Files/Altair/2020-edu/security/altair_lic.dat - (Err: 6) Unable to read file License Path: C:/Program Files/Altair/2020-edu/hwdesktop\security\altair_lic.dat;D:\altair_lic.dat;C:/Program Files/Altair/2020-edu/security/altair_lic.dat No Available License

[@Aeroswap]

It's a license error. Please check if all installation settings are correct. Make sure that the license is correctly linked to the software. This will resolve the issue.