The build project will be in `prj` directory. If you modified the IP core, you need to close Vivado and run the above commands again.
## Simulate in ModelSim
Make sure you have ModelSim in PATH. Also make sure you already compiled the project and Xilinx libraries in Vivado. Make sure the `modelsim.ini` file is in `tools/sim` directory Then, run the following commands to simulate the project: