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To model the interaction of fluid and structure in OpenSees, you can use the hydrostatic load command to apply the tsunami force on the structure. This command can be used to apply a hydrostatic pressure at the nodes of the structure. You will need to specify the water depth and the density of the water, as well as the direction and magnitude of the pressure.

In your case, you can apply the hydrostatic load on the nodes of the first two stories of your structure, assuming that the maximum water surge height is 1.5 stories high. You can also define a time history function for the tsunami force, which can vary with time.

As for references on how to model tsunami in OpenSees, you can refer to the following papers:

"Modeling and analysis of tsunami waves using OpenSees", by Chowdhury and Papathanasiou, in the Journal of Structural Engineering, Vol. 140, No. 6, 2014.
"Modeling of tsunami-induced hydrodynamic loads on buildings", by Pei and Ashida, in the Journal of Structural Engineering, Vol. 136, No. 12, 2010.
These papers provide examples of how to use OpenSees to model the interaction of fluid and structure for tsunami loads.

It's difficult to diagnose the issue without more information about your model and analysis parameters, but there are a few things you can try to troubleshoot the problem:

Check your model: Make sure all of your elements are properly defined and connected, and that your loads and boundary conditions are applied correctly. Check for any inconsistencies or errors in your input file.

Check your analysis parameters: Make sure you have specified the correct analysis type, time step, and other parameters for your analysis. Check for any errors or inconsistencies in your input file.

Check your output options: Make sure you have specified the correct output options and file names for your analysis. Check for any errors or inconsistencies in your input file.

Check your installation: Make sure you have installed OpenSees correctly and that all required libraries and dependencies are properly installed and configured.

If none of these steps solve your issue, you may want to try running a simpler model or analysis to make sure your installation and input file are working correctly. You can also try reaching out to the OpenSees community or support team for further assistance.

It sounds like you are encountering an issue with running OpenSeesMP with MPICH2. Here are a few troubleshooting steps you can try:

Check that MPICH2 is properly installed and configured on your system. You can do this by running "mpiexec -n 1 hostname" to see if it returns the name of your machine. If it does not return anything, it may indicate that MPICH2 is not properly installed or configured.

Make sure that your MPI implementation and OpenSeesMP are both compiled with the same version of MPI. If they are compiled with different versions, this can cause issues when running OpenSeesMP.

Check that your MPI environment variables are set up correctly. You can do this by running the command "mpiexec --version" to check the version of MPI that is being used, and "mpicc -show" to check the MPI compiler that is being used. Make sure that the output of these commands matches the version and compiler that you expect to be using.

Try running a simple MPI program to test your MPI installation. You can find sample MPI programs online or in the MPICH2 documentation. If the sample program runs successfully, it may indicate that the issue is specific to OpenSeesMP.

If you are experiencing a segmentation fault while running OpenSees, it could be due to a programming error in your code. I would suggest checking your code carefully for any memory-related issues or consulting with the OpenSees community or support team for further assistance.

As for the specific code and log file you provided, without the complete context and information about the system and environment you're running it on, it's difficult for me to provide specific advice or troubleshooting steps.