How to request CE_FRIC interface TH output? Or: how to request friction energy?

Ingeniorator

Hello everyone,

what do you have to set in order to request the CE_FRIC output? The documentation is very unclear and only mentions the existence of said output variable. Screenshot from the /TH/INTER doc:

It is mentioned below this table that the ENG_VERS card must be 2021, which is the case. So which interfaces actually support this output request? Is there something else that must be defined? I searched in the solver card TH/INTER but to no avail. For the moment, I'm using a TYPE20 interface but tried the TYPE24 as well, since it's mentioned in the doc, but without any change. Is this only available with QFRIC and TYPE7/TYPE21 interfaces? Which other methods are there to plot/monitor friction energy? Additionally, is there a specific way to monitor the total energy balance or should one just sum all relevant energies?

 

PaulAltair

In order to request it, you would set it as a variable like any other for the /TH/INTER for the interface, As shown in your screenshot, card shown below

I checked for TYPE7 , TYPE24 and TYPE25 and it seems to work in all of those for me (I get values reported in T01 for both CE_FRIC and CE_ELAST)

For a TYPE20 the output is 0 throughout (TYPE20 was made obsolete/deprecated before the addition of this output type though so that may explain it), maybe that is why you didn't get anything?

I usually use TTE (total translational energy) and DTE (Total - External Work) to monitor energy balance

Ingeniorator

Paul Sharp_21301 said:

In order to request it, you would set it as a variable like any other for the /TH/INTER for the interface, As shown in your screenshot, card shown below

I checked for TYPE7 , TYPE24 and TYPE25 and it seems to work in all of those for me (I get values reported in T01 for both CE_FRIC and CE_ELAST)

For a TYPE20 the output is 0 throughout (TYPE20 was made obsolete/deprecated before the addition of this output type though so that may explain it), maybe that is why you didn't get anything?

I usually use TTE (total translational energy) and DTE (Total - External Work) to monitor energy balance

Thanks for the reply. I added the sections in the input deck like you did, following the block format. Is there no way in Hypermesh to add the requests?

 

 

Now with a TYPE24 contact there's a result to be queried in Hypergraph, but oddly both are named INTERFACE_UNDEFINED_RANK_26 and 27. The curves look similar to your picture, though.

PaulAltair

Hi, as of today, there is no way to enter those requests in in HM no, new features in the solver often lag in the pre-processor for a version or 2.

Regarding the output, there can also be a lag there with the readers for the output after the feature is added in the solver, but in this case it is read in HG 2021.2, I guess you are using an older version? (undefined rank wording is what you get when the reader is not up to date for the output)

Ingeniorator

Paul Sharp_21301 said:

Hi, as of today, there is no way to enter those requests in in HM no, new features in the solver often lag in the pre-processor for a version or 2.

Regarding the output, there can also be a lag there with the readers for the output after the feature is added in the solver, but in this case it is read in HG 2021.2, I guess you are using an older version? (undefined rank wording is what you get when the reader is not up to date for the output)

That makes sense, I'm using version 2021.0. Thanks for your help!