{"id":2122,"date":"2026-05-21T14:43:50","date_gmt":"2026-05-21T14:43:50","guid":{"rendered":"https:\/\/opm-project.org\/?p=2122"},"modified":"2026-05-21T15:34:36","modified_gmt":"2026-05-21T15:34:36","slug":"new-release-2026-04","status":"publish","type":"post","link":"https:\/\/opm-project.org\/?p=2122","title":{"rendered":"New Release 2026.04"},"content":{"rendered":"\n<p>We can now announce the release of the 2026.04 version of OPM Flow. Binary packages are available in OPM\u2019s PPA (personal package archives), ppa:opm\/ppa. If you have not already enabled this PPA in your package sources you can do so through the following three commands:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt-add-repository ppa:opm\/ppa\nsudo apt install libopm-simulators-bin<\/code><\/pre>\n\n\n\n<p>Please check our <a href=\"https:\/\/opm-project.org\/?page_id=245\">installation instructions<\/a> for more details. Optional packages for MPI and Python bindings are highly recommended.<\/p>\n\n\n\n<p>The 2026.04 OPM Flow release supports the following two Ubuntu LTS versions<\/p>\n\n\n\n<ul>\n<li>24.04 LTS (codename Noble Numbat)<\/li>\n\n\n\n<li>26.04 LTS (codename Resolute Racoon)<\/li>\n<\/ul>\n\n\n\n<p>Binary packages are also available for RHEL 8. Python packages (linux amd64 and macOS arm64) can be installed via<\/p>\n\n\n\n<p><code>pip install opm<\/code><\/p>\n\n\n\n<p>and, finally, <a href=\"https:\/\/hub.docker.com\/r\/openporousmedia\/opmreleases\" data-type=\"link\" data-id=\"https:\/\/hub.docker.com\/r\/openporousmedia\/opmreleases\">Dockerhub<\/a> holds amd64, arm64, and NVidia and AMD GPU images.<\/p>\n\n\n\n<p>If you wish to build the release manually on your own system you can check out the release\/2026.04 branch or tag release\/2026.04\/final.<\/p>\n\n\n\n<p>This release brings many contributions, improvements, and fixes. The preliminary release notes are provided in each repository:<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/OPM\/opm-common\/releases\/tag\/release%2F2026.04%2Ffinal\">OPM Common 2026.04 Release <\/a><a href=\"https:\/\/github.com\/OPM\/opm-common\/releases\/tag\/release%2F2025.10%2Ffinal\">Notes<\/a><br><a href=\"https:\/\/github.com\/OPM\/opm-grid\/releases\/tag\/release%2F2026.04%2Ffinal\">OPM Grid 2026.04 Release Notes<\/a><br><a href=\"https:\/\/github.com\/OPM\/opm-simulators\/releases\/tag\/release%2F2026.04%2Ffinal\">OPM Simulators 2026.04 Release Notes<\/a><\/p>\n\n\n\n<p>This release&#8217;s highlights are:<\/p>\n\n\n\n<ul>\n<li>Added the option to solve the energy equations sequentially after the black-oil equations.<\/li>\n\n\n\n<li>Support has been added for pressure and temperature dependent water viscosity for runs with brine (BRINE) and energy (THERMAL).<\/li>\n\n\n\n<li>Flow now supports runs with brine (BRINE) and energy (THERMAL).<\/li>\n\n\n\n<li>Added support for double precision WORK arrays for compressed property arrays (for example SOGCR).<\/li>\n\n\n\n<li>If necessary, the gas PVT tables PVTG and PVDG are modified internally to ensure that negative inverse formation volume factors will never be extrapolated.<\/li>\n\n\n\n<li>Implemented endpoint scaling for gas-water systems.<\/li>\n\n\n\n<li>Killough&#8217;s hysteresis wetting phase modification (EHYSTR keyword item 13) is now supported.<\/li>\n\n\n\n<li>Added support for RSCONST keyword to define a constant solution gas-oil ratio for all dead oil PVT tables.<\/li>\n\n\n\n<li>Added support for EQUIL keyword item 9 (EQLOPT3) greater than zero.<\/li>\n\n\n\n<li>Added support for well energy injection\/production rate and total summary vectors: WTPRHEA, WTPTHEA, WTIRHEA and WTITHEA.<\/li>\n\n\n\n<li>Support has been added for the gas lift injection total summary vectors: FGLIT, GGLIT, and WGLIT.<\/li>\n\n\n\n<li>Extended summary (ESMRY) files are now output by default. The command line option &#8211;enable-esmry is now set to true by default.<\/li>\n\n\n\n<li>Added support for region oil recovery efficiency summary vector ROE.<\/li>\n\n\n\n<li>Production and gas lift supply rates from satellite groups (GSATPROD) are now accumulated in summary output.<\/li>\n\n\n\n<li>Added support for inter-block flows of oil, water, and gas in the negative i, j, and k directions (BFLO[GOW][IJK]-).<\/li>\n\n\n\n<li>Added support for summary output of inter-block oil, water, and gas velocities in the positive\/negative i, j, and k directions (BVEL[GOW][IJK][-]).<\/li>\n\n\n\n<li>All current well lists are now reported to the Print (PRT) file when the WELSPECS mnemonic is specified on the RPTSCHED keyword.<\/li>\n\n\n\n<li>Support for using the WDFAC and BRANPROP keywords in an ACTIONX block has been successfully tested.<\/li>\n\n\n\n<li>The grid independent well keywords WELTRAJ and COMPTRAJ now partially support multi-segment wells.<\/li>\n\n\n\n<li>Added support for using well completion quantities in ACTIONX Boolean conditions.<\/li>\n\n\n\n<li>Added partial support for the TUNINGDP keyword.<\/li>\n\n\n\n<li>Added support for VFPPROD tables with only one data record (single-line lift curves).<\/li>\n\n\n\n<li>The default value for the NUPCOL keyword has been reduced to from 12 to 3.<\/li>\n\n\n\n<li>Drift compensation is now applied to mass losses in the energy equations when using the temperature model (TEMP).<\/li>\n<\/ul>\n\n\n\n<p>More comprehensive list will be published in the reference manual soon. The list is already on <a href=\"https:\/\/github.com\/OPM\/opm-reference-manual\/\">github<\/a> in opm-reference-manual\/parts\/appendices\/B.fodt. Unfortunately, the raw file (as displayed on github) is not designed to be read.<\/p>\n\n\n\n<p>Thank you, again, to all who contributed to this release. Users who reported issues, developers who added new features,  improved performance, and provided fixes to issues. I would like to thank Markus Blatt and Arne Morten Kvarving for helping me manage the release and for building the binary packages.<\/p>\n\n\n\n<p>Best Regards,<\/p>\n\n\n\n<p>Michal T\u00f3th<br>Dr. Blatt &#8211; HPC Simulation Software &amp; Services<\/p>\n\n\n\n<p>OPM 2026.04 Release Manager<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We can now announce the release of the 2026.04 version of OPM Flow. Binary packages are available in OPM\u2019s PPA (personal package archives), ppa:opm\/ppa. If you have not already enabled this PPA in your package sources you can do so through the following three commands: Please check our installation instructions for more details. Optional packages &hellip; <a href=\"https:\/\/opm-project.org\/?p=2122\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">New Release 2026.04<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/opm-project.org\/index.php?rest_route=\/wp\/v2\/posts\/2122"}],"collection":[{"href":"https:\/\/opm-project.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/opm-project.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/opm-project.org\/index.php?rest_route=\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/opm-project.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2122"}],"version-history":[{"count":4,"href":"https:\/\/opm-project.org\/index.php?rest_route=\/wp\/v2\/posts\/2122\/revisions"}],"predecessor-version":[{"id":2126,"href":"https:\/\/opm-project.org\/index.php?rest_route=\/wp\/v2\/posts\/2122\/revisions\/2126"}],"wp:attachment":[{"href":"https:\/\/opm-project.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/opm-project.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/opm-project.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}