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<h1 id="ansys-fluent">ANSYS - Fluent<a class="headerlink" href="#ansys-fluent" title="Permanent link"></a></h1>
<p>Is always recommended to check which parameters are available in Fluent and adapt the below example according to your needs.
For that, run <code>fluent -help</code> for getting a list of options. However, as when running Fluent one must specify one of the
following flags:</p>
<ul>
<li><strong>2d</strong>: This is a 2D solver with single point precision.</li>
<li><strong>3d</strong>: This is a 3D solver with single point precision.</li>
<li><strong>2dpp</strong>: This is a 2D solver with double point precision.</li>
<li><strong>3dpp</strong>: This is a 3D solver with double point precision.</li>
</ul>
<h2 id="running-fluent-jobs">Running Fluent jobs<a class="headerlink" href="#running-fluent-jobs" title="Permanent link"></a></h2>
<h3 id="pmodules">PModules<a class="headerlink" href="#pmodules" title="Permanent link"></a></h3>
<p>Is strongly recommended the use of the latest ANSYS software available in PModules.</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>module<span class="w"> </span>use<span class="w"> </span>unstable
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>module<span class="w"> </span>load<span class="w"> </span>Pmodules/1.1.6
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>module<span class="w"> </span>use<span class="w"> </span>overlay_merlin
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a>module<span class="w"> </span>load<span class="w"> </span>ANSYS/2022R1
</span></code></pre></div>
<h3 id="interactive-rsm-from-remote-psi-workstations">Interactive: RSM from remote PSI Workstations<a class="headerlink" href="#interactive-rsm-from-remote-psi-workstations" title="Permanent link"></a></h3>
<p>Is possible to run Fluent through RSM from remote PSI (Linux or Windows)
Workstation having a local installation of ANSYS Fluent and RSM client. For
that, please refer to the <a href="../ansys-rsm/">ANSYS RSM</a> in the Merlin
documentation for further information of how to setup a RSM client for
submitting jobs to Merlin.</p>
<h3 id="non-interactive-sbatch">Non-interactive: sbatch<a class="headerlink" href="#non-interactive-sbatch" title="Permanent link"></a></h3>
<p>Running jobs with <code>sbatch</code> is always the recommended method. This makes the use
of the resources more efficient. For running it as a job, one needs to run in
no graphical mode (<code>-g</code> option).</p>
<h4 id="serial-example">Serial example<a class="headerlink" href="#serial-example" title="Permanent link"></a></h4>
<p>This example shows a very basic serial job.</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="ch">#!/bin/bash</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="c1">#SBATCH --job-name=Fluent # Job Name</span>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="c1">#SBATCH --partition=hourly # Using 'daily' will grant higher priority than 'general'</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="c1">#SBATCH --time=0-01:00:00 # Time needed for running the job. Must match with 'partition' limits.</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="c1">#SBATCH --cpus-per-task=1 # Double if hyperthreading enabled</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="c1">#SBATCH --hint=nomultithread # Disable Hyperthreading</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="c1">#SBATCH --error=slurm-%j.err # Define your error file</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>module<span class="w"> </span>use<span class="w"> </span>unstable
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a>module<span class="w"> </span>load<span class="w"> </span>ANSYS/2020R1-1
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="c1"># [Optional:BEGIN] Specify your license server if this is not 'lic-ansys.psi.ch'</span>
</span><span id="__span-1-13"><a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="nv">LICENSE_SERVER</span><span class="o">=</span>&lt;your_license_server&gt;
</span><span id="__span-1-14"><a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="nb">export</span><span class="w"> </span><span class="nv">ANSYSLMD_LICENSE_FILE</span><span class="o">=</span><span class="m">1055</span>@<span class="nv">$LICENSE_SERVER</span>
</span><span id="__span-1-15"><a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="nb">export</span><span class="w"> </span><span class="nv">ANSYSLI_SERVERS</span><span class="o">=</span><span class="m">2325</span>@<span class="nv">$LICENSE_SERVER</span>
</span><span id="__span-1-16"><a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="c1"># [Optional:END]</span>
</span><span id="__span-1-17"><a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a>
</span><span id="__span-1-18"><a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a><span class="nv">JOURNAL_FILE</span><span class="o">=</span>/data/user/caubet_m/Fluent/myjournal.in
</span><span id="__span-1-19"><a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a>fluent<span class="w"> </span>3ddp<span class="w"> </span>-g<span class="w"> </span>-i<span class="w"> </span><span class="si">${</span><span class="nv">JOURNAL_FILE</span><span class="si">}</span>
</span></code></pre></div>
<p>One can enable hypertheading by defining <code>--hint=multithread</code>, <code>--cpus-per-task=2</code> and <code>--ntasks-per-core=2</code>.
However, this is in general not recommended, unless one can ensure that can be beneficial.</p>
<h4 id="mpi-based-example">MPI-based example<a class="headerlink" href="#mpi-based-example" title="Permanent link"></a></h4>
<p>An example for running Fluent using a Slurm batch script is the following:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="ch">#!/bin/bash</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="c1">#SBATCH --job-name=Fluent # Job Name</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="c1">#SBATCH --partition=hourly # Using 'daily' will grant higher priority than 'general'</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="c1">#SBATCH --time=0-01:00:00 # Time needed for running the job. Must match with 'partition' limits.</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="c1">#SBATCH --nodes=1 # Number of nodes</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="c1">#SBATCH --ntasks=44 # Number of tasks</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="c1">#SBATCH --cpus-per-task=1 # Double if hyperthreading enabled</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="c1">#SBATCH --ntasks-per-core=1 # Run one task per core</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="c1">#SBATCH --hint=nomultithread # Disable Hyperthreading</span>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="c1">#SBATCH --error=slurm-%j.err # Define a file for standard error messages</span>
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="c1">##SBATCH --exclusive # Uncomment if you want exclusive usage of the nodes</span>
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a>
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a>module<span class="w"> </span>use<span class="w"> </span>unstable
</span><span id="__span-2-14"><a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a>module<span class="w"> </span>load<span class="w"> </span>ANSYS/2020R1-1
</span><span id="__span-2-15"><a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a>
</span><span id="__span-2-16"><a id="__codelineno-2-16" name="__codelineno-2-16" href="#__codelineno-2-16"></a><span class="c1"># [Optional:BEGIN] Specify your license server if this is not 'lic-ansys.psi.ch'</span>
</span><span id="__span-2-17"><a id="__codelineno-2-17" name="__codelineno-2-17" href="#__codelineno-2-17"></a><span class="nv">LICENSE_SERVER</span><span class="o">=</span>&lt;your_license_server&gt;
</span><span id="__span-2-18"><a id="__codelineno-2-18" name="__codelineno-2-18" href="#__codelineno-2-18"></a><span class="nb">export</span><span class="w"> </span><span class="nv">ANSYSLMD_LICENSE_FILE</span><span class="o">=</span><span class="m">1055</span>@<span class="nv">$LICENSE_SERVER</span>
</span><span id="__span-2-19"><a id="__codelineno-2-19" name="__codelineno-2-19" href="#__codelineno-2-19"></a><span class="nb">export</span><span class="w"> </span><span class="nv">ANSYSLI_SERVERS</span><span class="o">=</span><span class="m">2325</span>@<span class="nv">$LICENSE_SERVER</span>
</span><span id="__span-2-20"><a id="__codelineno-2-20" name="__codelineno-2-20" href="#__codelineno-2-20"></a><span class="c1"># [Optional:END]</span>
</span><span id="__span-2-21"><a id="__codelineno-2-21" name="__codelineno-2-21" href="#__codelineno-2-21"></a>
</span><span id="__span-2-22"><a id="__codelineno-2-22" name="__codelineno-2-22" href="#__codelineno-2-22"></a><span class="nv">JOURNAL_FILE</span><span class="o">=</span>/data/user/caubet_m/Fluent/myjournal.in
</span><span id="__span-2-23"><a id="__codelineno-2-23" name="__codelineno-2-23" href="#__codelineno-2-23"></a>fluent<span class="w"> </span>3ddp<span class="w"> </span>-g<span class="w"> </span>-t<span class="w"> </span><span class="si">${</span><span class="nv">SLURM_NTASKS</span><span class="si">}</span><span class="w"> </span>-i<span class="w"> </span><span class="si">${</span><span class="nv">JOURNAL_FILE</span><span class="si">}</span>
</span></code></pre></div>
<p>In the above example, one can increase the number of <em>nodes</em> and/or <em>ntasks</em> if needed. One can remove
<code>--nodes</code> for running on multiple nodes, but may lead to communication overhead. In general, <strong>no
hyperthreading</strong> is recommended for MPI based jobs. Also, one can combine it with <code>--exclusive</code> when necessary.</p>
<h2 id="interactive-salloc">Interactive: salloc<a class="headerlink" href="#interactive-salloc" title="Permanent link"></a></h2>
<p>Running Fluent interactively is strongly not recommended and one should
whenever possible use <code>sbatch</code>. However, sometimes interactive runs are
needed. For jobs requiring only few CPUs (in example, 2 CPUs) <strong>and</strong> for a
short period of time, one can use the login nodes. Otherwise, one must use the
Slurm batch system using allocations:</p>
<ul>
<li>For short jobs requiring more CPUs, one can use the Merlin shortest partitions (<code>hourly</code>).</li>
<li>For longer jobs, one can use longer partitions, however, interactive access
is not always possible (depending on the usage of the cluster).</li>
</ul>
<p>Please refer to the documentation <strong><a href="../../slurm-general-docs/interactive-jobs/">Running Interactive
Jobs</a></strong> for firther information about different
ways for running interactive jobs in the Merlin6 cluster.</p>
<h3 id="requirements">Requirements<a class="headerlink" href="#requirements" title="Permanent link"></a></h3>
<h4 id="ssh-keys">SSH Keys<a class="headerlink" href="#ssh-keys" title="Permanent link"></a></h4>
<p>Running Fluent interactively requires the use of SSH Keys. This is the way of
communication between the GUI and the different nodes. For doing that, one must
have a <strong>passphrase protected</strong> SSH Key. If the user does not have SSH Keys yet
(simply run <strong><code>ls $HOME/.ssh/</code></strong> to check whether <strong><code>id_rsa</code></strong> files exist or
not). For deploying SSH Keys for running Fluent interactively, one should
follow this documentation: <strong><a href="../../how-to-use-merlin/ssh-keys/">Configuring SSH Keys</a></strong></p>
<h4 id="list-of-hosts">List of hosts<a class="headerlink" href="#list-of-hosts" title="Permanent link"></a></h4>
<p>For running Fluent using Slurm computing nodes, one needs to get the list of
the reserved nodes. For getting that list, once you have the allocation, one
can run the following command:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>scontrol<span class="w"> </span>show<span class="w"> </span>hostname
</span></code></pre></div>
<p>This list must be included in the settings as the list of hosts where to run
Fluent. Alternatively, one can give that list as parameter (<code>-cnf</code> option) when
running <code>fluent</code>, as follows:</p>
<details class="example">
<summary>Running Fluent with 'salloc'</summary>
<div class="language-console highlight"><span class="filename">Bash Session</span><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="gp">$ </span>salloc<span class="w"> </span>--nodes<span class="o">=</span><span class="m">2</span><span class="w"> </span>--ntasks<span class="o">=</span><span class="m">88</span><span class="w"> </span>--hint<span class="o">=</span>nomultithread<span class="w"> </span>--time<span class="o">=</span><span class="m">0</span>-01:00:00<span class="w"> </span>--partition<span class="o">=</span><span class="nb">test</span><span class="w"> </span><span class="nv">$SHELL</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a><span class="go">salloc: Pending job allocation 135030174</span>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="go">salloc: job 135030174 queued and waiting for resources</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="go">salloc: job 135030174 has been allocated resources</span>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a><span class="go">salloc: Granted job allocation 135030174</span>
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6" href="#__codelineno-4-6"></a>
</span><span id="__span-4-7"><a id="__codelineno-4-7" name="__codelineno-4-7" href="#__codelineno-4-7"></a><span class="gp">$ </span>module<span class="w"> </span>use<span class="w"> </span>unstable
</span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="gp">$ </span>module<span class="w"> </span>load<span class="w"> </span>ANSYS/2020R1-1
</span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="go">module load: unstable module has been loaded -- ANSYS/2020R1-1</span>
</span><span id="__span-4-10"><a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a>
</span><span id="__span-4-11"><a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a><span class="gp">$ </span>fluent<span class="w"> </span>3ddp<span class="w"> </span>-t<span class="nv">$SLURM_NPROCS</span><span class="w"> </span>-cnf<span class="o">=</span><span class="k">$(</span>scontrol<span class="w"> </span>show<span class="w"> </span>hostname<span class="w"> </span><span class="p">|</span><span class="w"> </span>tr<span class="w"> </span><span class="s1">'\n'</span><span class="w"> </span><span class="s1">','</span><span class="k">)</span>
</span><span id="__span-4-12"><a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a>
</span><span id="__span-4-13"><a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a><span class="gp">$ </span><span class="nb">exit</span>
</span><span id="__span-4-14"><a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a><span class="go">exit</span>
</span><span id="__span-4-15"><a id="__codelineno-4-15" name="__codelineno-4-15" href="#__codelineno-4-15"></a><span class="go">salloc: Relinquishing job allocation 135030174</span>
</span><span id="__span-4-16"><a id="__codelineno-4-16" name="__codelineno-4-16" href="#__codelineno-4-16"></a><span class="go">salloc: Job allocation 135030174 has been revoked.</span>
</span></code></pre></div>
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