{"id":166787,"date":"2023-04-05T14:32:06","date_gmt":"2023-04-05T14:32:06","guid":{"rendered":"\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/"},"modified":"2023-07-31T12:27:41","modified_gmt":"2023-07-31T12:27:41","slug":"how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/","title":{"rendered":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations?"},"content":{"rendered":"<p>Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files.   The better alternative is to use the command, as this can be used more generally.   Please find below an example in which an expression &#8220;VarIter&#8221; is stored in a Perl variable and then applied to the solver control parameter &#8220;Maximum Number of Iterations&#8221;. This parameter does not accept expressions in CFX-Pre, so only with such a session file this parameter can be set controlled by other variables.  ! ($VarIter,$units) = evaluate(&#8220;VarIter&#8221;);  FLOW: Flow Analysis 1   &#038;replace   SOLVER CONTROL:     CONVERGENCE CONTROL:       Maximum Number of Iterations = $VarIter     END # CONVERGENCE CONTROL:   END # SOLVER CONTROL: END # FLOW:Flow Analysis 1 > update<\/p>\n","protected":false},"template":"","class_list":["post-166787","topic","type-topic","status-publish","hentry","topic-tag-4391","topic-tag-cfx","topic-tag-fluid-dynamics","topic-tag-general","topic-tag-general-cfx"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression &quot;VarIter&quot; is stored in a Perl variable and\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression &quot;VarIter&quot; is stored in a Perl variable and\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-04-05T14:32:06+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:27:41+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression &quot;VarIter&quot; is stored in a Perl variable and\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/#listItem\",\"name\":\"cfx\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/#listItem\",\"position\":3,\"name\":\"cfx\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\\\/#listItem\",\"name\":\"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\\\/#listItem\",\"position\":4,\"name\":\"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/#listItem\",\"name\":\"cfx\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\\\/\",\"name\":\"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations? | Ansys Knowledge\",\"description\":\"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression \\\"VarIter\\\" is stored in a Perl variable and\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\\\/#breadcrumblist\"},\"datePublished\":\"2023-04-05T14:32:06+00:00\",\"dateModified\":\"2023-07-31T12:27:41+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations? | Ansys Knowledge","description":"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression \"VarIter\" is stored in a Perl variable and","canonical_url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/knowledge","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/#listItem","name":"cfx"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/#listItem","position":3,"name":"cfx","item":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/#listItem","name":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations?"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/#listItem","position":4,"name":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations?","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/#listItem","name":"cfx"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization","name":"Ansys Knowledge","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/knowledge\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/#webpage","url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/","name":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations? | Ansys Knowledge","description":"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression \"VarIter\" is stored in a Perl variable and","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/#breadcrumblist"},"datePublished":"2023-04-05T14:32:06+00:00","dateModified":"2023-07-31T12:27:41+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website","url":"https:\/\/innovationspace.ansys.com\/knowledge\/","name":"Ansys Knowledge","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Knowledge | Ansys Innovation Space","og:type":"article","og:title":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations? | Ansys Knowledge","og:description":"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression &quot;VarIter&quot; is stored in a Perl variable and","og:url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/","article:published_time":"2023-04-05T14:32:06+00:00","article:modified_time":"2023-07-31T12:27:41+00:00","twitter:card":"summary_large_image","twitter:title":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations? | Ansys Knowledge","twitter:description":"Typically the Power Syntax command getExprVal() is applied to extract values from an expression. However, this is not available in CFX-Pre session files. The better alternative is to use the command, as this can be used more generally. Please find below an example in which an expression &quot;VarIter&quot; is stored in a Perl variable and"},"aioseo_meta_data":{"post_id":"166787","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2025-10-17 23:16:18","updated":"2026-07-29 19:41:07","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/\" title=\"cfx\">cfx<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tHow to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations?\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/knowledge"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/"},{"label":"cfx","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/"},{"label":"How to extract an expression value in a CFX-Pre session file and to assign this to a parameter setting which does not otherwise accept expressions, like the maximum number of iterations?","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-extract-an-expression-value-in-a-cfx-pre-session-file-and-to-assign-this-to-a-parameter-setting-which-does-not-otherwise-accept-expressions-like-the-maximum-number-of-iterations\/"}],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["5\/4\/2023 20:20"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["209.182.204.162"],"_btv_view_count":["902"],"siebel_km_number":["2053326"],"product_version":["19"],"km_published_date":["2018-02-21T00:00:00.000Z"],"family":["Fluid Dynamics"],"application_name":["CFX"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166787","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166787\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=166787"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}