{"id":39676,"date":"2019-12-17T16:17:29","date_gmt":"2019-12-17T16:17:29","guid":{"rendered":"\/forum\/forums\/topic\/ansys-fluent-ntgk-parameter-estimation-tool\/"},"modified":"2019-12-17T16:17:29","modified_gmt":"2019-12-17T16:17:29","slug":"ansys-fluent-ntgk-parameter-estimation-tool","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/ansys-fluent-ntgk-parameter-estimation-tool\/","title":{"rendered":"Ansys Fluent NTGK parameter estimation tool"},"content":{"rendered":"

 <\/p>\n

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Hello,<\/p>\n

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For my thesis I’m designing a batterypack for an application. Currently I’m trying to determine the U and Y coefficients for the NTGK battery model. Because I’m not able to do any experiments yet I used a graph delivered by the battery supplier (Voltage in functon of time in minutes). You can see the graph below. I extracted the values from the graph and wrote them in three .txt files (1C;2C and 3C). Completely below the text files are shown.<\/p>\n

<\/p>\n

\"C-rates<\/p>\n

<\/p>\n

With the parameter estimation tool I’ve readed the .txt files into Ansys. The tool calculated the Y and U parameters as shown below. I also added the model options (50Ah 3,2V pouch cell). As you can see the parameter bo isn’t correct because it’s shown in a red box. This parameter should be a positive number.<\/p>\n

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\"\"<\/p>\n

<\/p>\n

The experimental and fitted results are shown below. As you can see these results doesn’t match the first graph at all and I can’t figure it out what I’m doing wrong.<\/p>\n

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\"\"<\/p>\n

<\/p>\n

Text file 1C rate (time in seconds | voltage in V):<\/p>\n

<\/p>\n

<\/p>\n

Crate 1.0<\/p>\n

<\/p>\n

0001e+00  3.400e+00 <\/p>\n

<\/p>\n

0068e+00  3.252e+00 <\/p>\n

<\/p>\n

0194e+00  3.252e+00 <\/p>\n

<\/p>\n

0332e+00  3.249e+00 <\/p>\n

<\/p>\n

0466e+00  3.247e+00 <\/p>\n

<\/p>\n

0597e+00  3.239e+00 <\/p>\n

<\/p>\n

0862e+00  3.231e+00 <\/p>\n

<\/p>\n

0994e+00  3.225e+00 <\/p>\n

<\/p>\n

1260e+00  3.217e+00 <\/p>\n

<\/p>\n

1392e+00  3.213e+00 <\/p>\n

<\/p>\n

1657e+00  3.206e+00 <\/p>\n

<\/p>\n

1922e+00  3.198e+00 <\/p>\n

<\/p>\n

2320e+00  3.188e+00 <\/p>\n

<\/p>\n

2585e+00  3.172e+00 <\/p>\n

<\/p>\n

3248e+00  3.119e+00 <\/p>\n

<\/p>\n

3703e+00  2.889e+00 <\/p>\n

<\/p>\n

3832e+00  2.576e+00 <\/p>\n

<\/p>\n

3878e+00  2.368e+00 <\/p>\n

<\/p>\n

3949e+00  2.146e+00 <\/p>\n

<\/p>\n

3989e+00  2.003e+00 <\/p>\n

<\/p>\n

 <\/p>\n

\n<\/p><\/blockquote>\n

<\/p>\n

Text file 2C rate:<\/p>\n

<\/p>\n

<\/p>\n

Crate 2.0<\/p>\n

<\/p>\n

0001e+00  3.400e+00 <\/p>\n

<\/p>\n

0060e+00  3.187e+00 <\/p>\n

<\/p>\n

0200e+00  3.178e+00 <\/p>\n

<\/p>\n

0333e+00  3.172e+00 <\/p>\n

<\/p>\n

0465e+00  3.165e+00 <\/p>\n

<\/p>\n

0598e+00  3.156e+00 <\/p>\n

<\/p>\n

0730e+00  3.151e+00 <\/p>\n

<\/p>\n

0863e+00  3.141e+00 <\/p>\n

<\/p>\n

0995e+00  3.131e+00 <\/p>\n

<\/p>\n

1261e+00  3.108e+00 <\/p>\n

<\/p>\n

1515e+00  3.058e+00 <\/p>\n

<\/p>\n

1656e+00  2.976e+00 <\/p>\n

<\/p>\n

1744e+00  2.838e+00 <\/p>\n

<\/p>\n

1776e+00  2.750e+00 <\/p>\n

<\/p>\n

1802e+00  2.599e+00 <\/p>\n

<\/p>\n

1825e+00  2.504e+00 <\/p>\n

<\/p>\n

1850e+00  2.383e+00 <\/p>\n

<\/p>\n

1892e+00  2.195e+00 <\/p>\n

<\/p>\n

1901e+00  2.101e+00 <\/p>\n

<\/p>\n

1913e+00  2.012e+00 <\/p>\n

\n<\/p><\/blockquote>\n

<\/p>\n

 <\/p>\n

<\/p>\n

Text file 3C rate:<\/p>\n

<\/p>\n

<\/p>\n

Crate 3.0<\/p>\n

<\/p>\n

0001e+00  3.400e+00 <\/p>\n

<\/p>\n

0001e+00  3.134e+00 <\/p>\n

<\/p>\n

0134e+00  3.118e+00 <\/p>\n

<\/p>\n

0267e+00  3.109e+00 <\/p>\n

<\/p>\n

0400e+00  3.098e+00 <\/p>\n

<\/p>\n

0532e+00  3.090e+00 <\/p>\n

<\/p>\n

0665e+00  3.073e+00 <\/p>\n

<\/p>\n

0798e+00  3.055e+00 <\/p>\n

<\/p>\n

0919e+00  3.027e+00 <\/p>\n

<\/p>\n

0997e+00  2.990e+00 <\/p>\n

<\/p>\n

1041e+00  2.955e+00 <\/p>\n

<\/p>\n

1075e+00  2.912e+00 <\/p>\n

<\/p>\n

1087e+00  2.869e+00 <\/p>\n

<\/p>\n

1113e+00  2.823e+00 <\/p>\n

<\/p>\n

1155e+00  2.623e+00 <\/p>\n

<\/p>\n

1201e+00  2.472e+00 <\/p>\n

<\/p>\n

1198e+00  2.388e+00 <\/p>\n

<\/p>\n

1226e+00  2.219e+00 <\/p>\n

<\/p>\n

1226e+00  2.180e+00 <\/p>\n

<\/p>\n

1250e+00  2.009e+00 <\/p>\n

\n<\/p><\/blockquote>\n

<\/p>\n

Extra information:<\/span><\/strong><\/p>\n

<\/p>\n

This is how the console looks like and what I’ve entered as input parameters in Ansys:<\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

And here are the DOD in function of the U and Y parameters:<\/p>\n

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\"\"<\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-39676","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["11855"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["1"],"_btv_view_count":["5089"],"_bbp_subscription":["245673","276959","199","285530","292611","294271"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["39676"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","69162","171337","171597","171727","173367","173578","174950","179708","187038","251771","253029","276959","285530","292611","294271"],"_bbp_voice_count":["16"],"_bbp_reply_count":["54"],"_bbp_last_reply_id":["308905"],"_bbp_last_active_id":["308905"],"_bbp_last_active_time":["2023-09-27 04:19:48"]},"test":"battery"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/39676","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/39676\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=39676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}