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ansys / pydpf-core

Data Processing Framework - Python Core
http://dpf.docs.pyansys.com/
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Extract nodal contact force #72

Open jbrunel59 opened 2 years ago

jbrunel59 commented 2 years ago

Is it possible to extract only nodal contact forces by using dpf? I've succeeded for the contact pressure but it seems not possible to extract forces easily?

rlagha commented 2 years ago

Hi @jbrunel59 , please could you try this and let me know if this helps?

nmisc = model.operator("mapdl::nmisc")
nmisc.connect(10,186) #item index 186
nmisc.connect(11,3) #3 componenents X, Y, Z 
fields = nmisc.outputs.fields_container()
jbrunel59 commented 2 years ago

Thanks you for your prompt answer. I will try today.

Can you confirm to me that this will return the values ​​of the contact forces to the nodes?

When I check with Ansys help, index 186 refers to total contact force, not nodal

rlagha commented 2 years ago

@jbrunel59 let me check with the solver team, if we can have the contact force directly on the nodes. Otherwise we may be able to compute it with the 1- contact pressure and element areas or 2- averaging the element contact force to the nodes by taking into account the contribution of each node area. We can write a dpf scripting workflow for both, but we need first to check if this is physically true. Regards Ramdane

jbrunel59 commented 2 years ago

I have checked and it doesn’t work.

With the python code:

nmisc = model.operator("mapdl::nmisc") nmisc.connect(10,186) #item index 186 nmisc.connect(11,3) # 3 componenents X, Y, Z fields = nmisc.outputs.fields_container()

I have a error: DPFServerException: mapdl::nmisc<-failed to read ESV from rst file

I have succeeded from contact pressure with:

pres=model.operator('ECT_PRES') pres.inputs.requested_location.connect('Nodal') pres.inputs.time_scoping.connect([i]) pression_c = pres.outputs.fields_container()

But I need the nodal contact force (array equivalent to NFORCE,CONT in APDL)

Thanks a lot

pmaroneh commented 2 years ago

Hello, could you please confirm that the contact elements you are considering are CONTA174 elements?

If so, NMISC 186,187,188 will give you access to CNTX, CNTY and CNTZ. These report the total contact element forces due to tangential stress. I'm not sure that this is what you're looking for. Based on description I think retrieving CNFX, CNFY and CNFZ would be more useful, which report the total contact element forces. These can be accessed in NMISC 43,44 and 45.

Retrieving NMISC from the result file supposes that such data has been saved to the result file, with appropriate setting in OUTPUT APDL command.

NFORCE,CONT command sums and prints, in each component direction for each selected contact node, the nodal force of the selected elements attached to the node. image image

In the end, using NMISC 43,44 and 45 would help getting the summed value, but not get the value per node. @rlagha I'll let you comment on this one.

jbrunel59 commented 2 years ago

Hello,

Yes, I use CONTA174 elements.

Perhaps, one solution can be to determine the area around each node because I’ve succeeded in the extraction of the nodal contact pressure. With these 2 datas, the nodal contact force can be determined and compared with the value obtained with nforce,cont apdl command.

Do you agree with that?

For the moment, I have not succeed in the extraction of the area around each contact node.

Thanks a lot.

Jeff

De : pmaroneh @. Envoyé : lundi 27 septembre 2021 12:42 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

Hello, could you please confirm that the contact elements you are considering are CONTA174 elements?

If so, NMISC 186,187,188 will give you access to CNTX, CNTY and CNTZ. These report the total contact element forces due to tangential stress. I'm not sure that this is what you're looking for. Based on description I think retrieving CNFX, CNFY and CNFZ would be more useful, which report the total contact element forces. These can be accessed in NMISC 43,44 and 45.

Retrieving NMISC from the result file supposes that such data has been saved to the result file, with appropriate setting in OUTPUT APDL command.

NFORCE,CONT command sums and prints, in each component direction for each selected contact node, the nodal force of the selected elements attached to the node. https://user-images.githubusercontent.com/76440649/134893272-a051f220-10bb-4423-b5e3-b7e0aa8727f7.png https://user-images.githubusercontent.com/76440649/134893308-87911543-094b-4ba3-bfba-a1ab03a266d6.png

In the end, using NMISC 43,44 and 45 would help getting the summed value, but not get the value per node. @rlagha https://github.com/rlagha I'll let you comment on this one.

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rlagha commented 2 years ago

@jbrunel59 for the area around each node did you tried to get nmisc of (59,60,61, 184)? you need to request nmisc to be saved in the result file. nmisc = model.operator("mapdl::nmisc") nmisc.connect(10,59) # and then 60, 61, 184 nmisc.connect(11,1) fields = nmisc.outputs.fields_container()

Thanks Ramdane

RGPATCHI commented 2 years ago

Hi @jbrunel59

I did a small test and using the below script, I was able to print contact force Y for each contact element. You just need to provide the necessary APDL commands (OUTRES) when solving the model, so that NMISC results are available in the rst file. I have listed the MAPDL commands I've used for your reference.

esel,s,ename,,174 ! select all contact elements for later inclusion in OUTRES component cm,_AllContacts,elem OUTRES,MISC,ALL,_AllContacts allsel,all

Python Script:

ansys.dpf import core as dpf

data_sources = dpf.DataSources()
data_sources.set_result_file_path(r'C:\Users\rgpatchi\AppData\Local\Temp\WB_rgpatchi_9224_2\wbnew_files\dp0\SYS\MECH\file.rst')
model=dpf.Model(data_sources)

nmisc = model.operator("mapdl::nmisc")
nmisc.connect(10,44) #item index 44 - CNFY
nmisc.connect(11,1) #1 component Y

fields = nmisc.outputs.fields_container()
field = fields[0]
print(field.data)
jbrunel59 commented 2 years ago

Hi,

Thanks, it is working.

Now, do you know how to have the nodes attached to each contact elements.

I tried with :

elements = model.metadata.meshed_region.elements

element=elements.element_by_id(i) # i= contact element number

node=element.node_ids

but it don’t work.

The error:

_InactiveRpcError: <_InactiveRpcError of RPC that terminated with:

            status = StatusCode.INTERNAL

            details = "node not found"

            debug_error_string = ***@***.***","description":"Error received from peer ipv4:127.0.0.1:50055","file":"src/core/lib/surface/call.cc","file_line":1068,"grpc_message":"node not found","grpc_status":13}"

Regards

De : RGPATCHI @. Envoyé : mercredi 29 septembre 2021 15:10 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

Hi @jbrunel59 https://github.com/jbrunel59

I did a small test and using the below script, I was able to print contact force Y for each contact element. You just need to provide the necessary APDL commands (OUTRES) when solving the model, so that NMISC results are available in the rst file. I have listed the MAPDL commands I've used for your reference.

esel,s,ename,,174 ! select all contact elements for later inclusion in OUTRES component cm,_AllContacts,elem OUTRES,MISC,ALL,_AllContacts allsel,all

Python Script: `from ansys.dpf import core as dpf

data_sources = dpf.DataSources() data_sources.set_result_file_path(r'C:\Users\rgpatchi\AppData\Local\Temp\WB_rgpatchi_9224_2\wbnew_files\dp0\SYS\MECH\file.rst') model=dpf.Model(data_sources)

nmisc = model.operator("mapdl::nmisc") nmisc.connect(10,44) #item index 44 - CNFY nmisc.connect(11,1) #1 https://github.com/pyansys/DPF-Core/pull/1 component Y

fields = nmisc.outputs.fields_container() field = fields[0] print(field.data) `

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rlagha commented 2 years ago

Hi @jbrunel59 , please could you try this:

scopingP = dpf.operators.scoping.on_property()
scopingP.inputs.property_name.connect("mapdl_element_type") #print(scopingP.inputs.property_name) to get different options
scopingP.inputs.property_id.connect(174)
scopingP.inputs.streams_container.connect(model.metadata.streams_provider)
eleScop = scopingP.outputs.mesh_scoping()
element = elements.element_by_id(eleScop.ids[1]) #first contact element
node=element.node_ids
node
jbrunel59 commented 2 years ago

What is scopingP ? Is it a package?

Thanks

De : rlagha @. Envoyé : vendredi 1 octobre 2021 13:57 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

Hi @jbrunel59 https://github.com/jbrunel59 , please could you try this:

scopingP.inputs.property_name.connect("mapdl_element_type") #print(scopingP.inputs.property_name) to get different options scopingP.inputs.property_id.connect(174) scopingP.inputs.streams_container.connect(model.metadata.streams_provider) eleScop = scopingP.outputs.mesh_scoping() element = elements.element_by_id(eleScop.ids[1]) #first contact element node=element.node_ids node

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rlagha commented 2 years ago

@jbrunel59 

scopingP = dpf.operators.scoping.on_property()
jbrunel59 commented 2 years ago

Ok. Thanks. Now I have a problem with the package dpf (module 'ansys.dpf.core' has no attribute 'operators'). I need version 0.3.0? If yes, I have also a problem in reading rst file

De : rlagha @. Envoyé : vendredi 1 octobre 2021 15:12 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

@jbrunel59 https://github.com/jbrunel59 scopingP = dpf.operators.scoping.on_property()

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rlagha commented 2 years ago

@jbrunel59 yes please install version 0.3.0. Do you use 2021 R2 Ansys unified install?

jbrunel59 commented 2 years ago

I use 2021R1 not R2 !

De : rlagha @. Envoyé : vendredi 1 octobre 2021 15:19 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

@jbrunel59 https://github.com/jbrunel59 yes please install version 0.3.0. Do you use 2021 R2 Ansys unified install?

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jbrunel59 commented 2 years ago

With version 0.3.0 and 2021R1, I’ve this error

Traceback (most recent call last):

File "", line 1, in 

scopingP = dpf.operators.scoping.on_property()

File "c:\program files\python36\lib\site-packages\ansys\dpf\core\operators\scoping\on_property.py", line 54, in init

super().__init__(name="scoping_provider_by_prop", config = config, server = server)

File "c:\program files\python36\lib\site-packages\ansys\dpf\core\dpf_operator.py", line 64, in init

server = serverlib._global_server()

File "c:\program files\python36\lib\site-packages\ansys\dpf\core\server.py", line 62, in _global_server

start_local_server()

File "c:\program files\python36\lib\site-packages\ansys\dpf\core\server.py", line 177, in start_local_server

server = DpfServer(ansys_path, ip, port,as_global= as_global, load_operators = load_operators)

File "c:\program files\python36\lib\site-packages\ansys\dpf\core\server.py", line 281, in init

launch_dpf(ansys_path, ip, port)

File "c:\program files\python36\lib\site-packages\ansys\dpf\core\server.py", line 475, in launch_dpf

stderr=subprocess.PIPE)

File "c:\program files\python36\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 143, in init

super(SubprocessPopen, self).__init__(*args, **kwargs)

File "c:\program files\python36\lib\subprocess.py", line 709, in init

restore_signals, start_new_session)

File "c:\program files\python36\lib\subprocess.py", line 997, in _execute_child

startupinfo)

FileNotFoundError: [WinError 2] Le fichier spécifié est introuvable

De : rlagha @. Envoyé : vendredi 1 octobre 2021 15:19 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

@jbrunel59 https://github.com/jbrunel59 yes please install version 0.3.0. Do you use 2021 R2 Ansys unified install?

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rlagha commented 2 years ago

With version 0.3.0 you will need 2021R2, do you have access to it? it's much better then 2021R1

jbrunel59 commented 2 years ago

I have to download and install it !!

Thanks a lot

De : rlagha @. Envoyé : vendredi 1 octobre 2021 15:32 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

With version 0.3.0 you will need 2021R2, do you have access to it? it's much better then 2021R1

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jbrunel59 commented 2 years ago

OK. I will try today.

A last question: do you know if it is possible to get the value of area for each node directly (in case of 2D model)?

Regards.

De : rlagha @. Envoyé : vendredi 1 octobre 2021 15:19 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

@jbrunel59 https://github.com/jbrunel59 yes please install version 0.3.0. Do you use 2021 R2 Ansys unified install?

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rlagha commented 2 years ago

@jbrunel59 , did you tried this? https://github.com/pyansys/DPF-Core/issues/72#issuecomment-929934752

jbrunel59 commented 2 years ago

Yes but it is for contact element.

I want to extract the area around each node for applying heat flow (sf apdl command) in a thermal analysis

De : rlagha @. Envoyé : lundi 4 octobre 2021 10:30 À : pyansys/DPF-Core @.> Cc : jbrunel59 @.>; Mention @.> Objet : Re: [pyansys/DPF-Core] Extract nodal contact force (#72)

@jbrunel59 https://github.com/jbrunel59 , did you tried this?

72 (comment) https://github.com/pyansys/DPF-Core/issues/72#issuecomment-929934752

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velazquezr35 commented 2 years ago

Hi there!

I have a simple question regarding a similar topic: I want to retrieve SMISC bending moment for beam elements (ids 2,15 for My and 3,16 for Mz) [BEAM188]

Why do you connect the op to (10, id)? Why the '10'? I can´t find it on the API nor the code.

In my case, i obtain good expected results using (for example, for i node) op.connect(10, 2)

At first, i thought this would work:

op = dpf.operators.result.smisc(data_sources=my_data_source_2_rst_file)
fields = op.outputs.fields_container()

But this error comes out:

    raise DPFServerException(details) from None

DPFServerException: mapdl::smisc<-failed to read ESV from rst file

So... ¿Why the .connect to input pin 10? I only found it here, not in the APIs... but it´s working!

Thanks in advance,

RR

velazquezr35 commented 2 years ago

PD: I ran some tests, it seems that only works for the input 10... All the others got the same error message.

API / code:

`
class smisc(Operator):
    """ Read SMISC results from the rst file.

      available inputs:
        - time_scoping (Scoping, list) (optional)
        - mesh_scoping (ScopingsContainer, Scoping, list) (optional)
        - fields_container (FieldsContainer) (optional)
        - streams_container (StreamsContainer, Stream) (optional)
        - data_sources (DataSources)
        - mesh (MeshedRegion) (optional)

      available outputs:
        - fields_container (FieldsContainer)
        - 
        - ....`