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Thermal-Flow
Contains general thermal and flow solver related documentation, such as the verification test cases, monthly critical fixes, DMP guide, and knowledge base articles.
Thermal and flow DMP guide
Describes the general workflow for executing the simulation jobs using distributed memory parallel processing on clusters and the scheduler-dependent files required to submit the jobs to the scheduler.
Submit a DMP simulation
You submit a DMP simulation from the TMG Executive Menu, which is on a machine that has access to the solution input XML file and the scheduler. It is preferable to use the head node of the cluster, which is accessible from all the nodes.

Thermal-Flow
Contains general thermal and flow solver related documentation, such as the verification test cases, monthly critical fixes, DMP guide, and knowledge base articles.
- TMG thermal-flow solvers
  Maya HTT develops and maintains a thermal solver and a flow solver, which are combined into the TMG thermal-flow solvers. These solvers are included and distributed with Simcenter 3D, NX, and Simcenter Femap. Older versions of TMG thermal-flow solvers are also included in NX I-deas.
- Thermal and flow verification test cases
  Contains verification test cases for the thermal and flow solvers.
- Monthly critical fixes
  Maya HTT strives to release the best thermal-flow solver by continually updating and fixing critical issues and releasing monthly updates to the solver. The following section lists the most critical issues fixed starting in March 2024.
- TMG Executive Menu
  TMG Executive Menu is a standalone application that lets you execute processes on thermal-flow files and solutions independently of Simcenter 3D or Simcenter Femap.
- Thermal and flow DMP guide
  Describes the general workflow for executing the simulation jobs using distributed memory parallel processing on clusters and the scheduler-dependent files required to submit the jobs to the scheduler.
  - Parallel processing on a cluster
    Using distributed memory architecture, the TMG thermal-flow solvers support high performance computing (HPC) for large models on a multi-node cluster. These solvers use Distributed Memory Parallel (DMP) processing based on domain decomposition and the message passing interface (MPI).
  - Executing DMP simulations
    The following workflow describes running DMP simulations. The TMG thermal-flow solvers installation, TMG Executive Menu, and required scheduler dependent files must be all accessible by the nodes in the cluster.
  - Submit a DMP simulation
    You submit a DMP simulation from the TMG Executive Menu, which is on a machine that has access to the solution input XML file and the scheduler. It is preferable to use the head node of the cluster, which is accessible from all the nodes.
  - Scheduler dependent files
    TMG Executive Menu requires multiple scheduler dependent files to communicate with a scheduler.
  - A host file
    The scheduler generates the mayampi.hosts file at runtime before running the jobs in parallel. This file includes a list of cluster nodes that will execute the jobs.
  - Running multiphysics solutions on clusters
    The installation package for the TMG thermal-flow solvers provides sample custom scripts to run multiphysics solutions on Linux clusters installed with Slurm (Simple Linux Utility for Resource Management) or PBS (Portable Batch System) job schedulers high-performance computing (HPC) environment.
- Solver supported compilers per version
  For each released version of the TMG thermal-flow solvers, the following table lists the compiler version that you can use when you compile your subroutine, thermal solver plugin function for expressions, or flow solver plugin function.
- Thermal-flow data exchange files
  The thermal and flow solvers in Simcenter 3D and Simcenter Femap create multiple thermal-flow data exchange files described on the following page.

Submit a DMP simulation

You submit a DMP simulation from the TMG Executive Menu, which is on a machine that has access to the solution input XML file and the scheduler. It is preferable to use the head node of the cluster, which is accessible from all the nodes.

You must have a DMP license and make sure it is available from the nodes in the cluster.
The following files are required and must be stored together in a run directory accessible to all the nodes in the cluster:
- A scheduler configuration file
- Submit and delete scripts
- A solution input XML file, <simulation name>-<solution name>.xml
The SPLM_LICENSE_SERVER, UGII_BASE_DIR, and UGII_TMG_DIR environment variables defined on the master node.

The following procedure lists the commands for a Linux machine. If necessary, adjust your commands for Windows.

Note:

This procedure uses the ND argument of the TMG Executive Menu, which requires only an XML input file. It does not work for multiphysics solutions, which also have a MPDAT input file and optionally a Nastran DAT input file.

Open a command prompt window and type the following command to start the TMG Executive Menu:
```
$UGII_TMG_DIR/com/tmgnx.com
```
At the prompt, enter the ND command switch to run the analysis from XML, using the DMP (scheduler) process.
At the prompt, enter:
1. The name of the solution input XML file.
2. The scheduler label, which is defined in the scheduler configuration file. For example:
```
<scheduler label=”MyDesktop”>
```
3. The number of processes required to run the simulation.

Alternatively, you can combine all steps using the following command:

$UGII_TMG_DIR/com/tmgnx.com ND -inPath <run_directory>/<simulation name>-<solution name>.xml <scheduler label> <number of processes>