Clarity on my first answer: Modal analysis being a purely linear dynamic analysis, any non-linearities present are either ignored or reduced to their linear counterparts (such as non-linear contacts with initial seperation are set as free). To account for non-linearities, you will need to perform a static analysis and use it as prestress condition. Also, as you mentioned, the bodies will come in contact during the analysis, deformation effects are not valid in modal anaysis, you will need to perform a static analysis for deformations.
Apart from that, I have few question regarding your model,
1. Just to confirm, are you performing a modal structural analysis or modal acoustic analysis?
2. Can you share what are goals and objectives of your analysis, you can share screenshots and probably a diagram of your system with annotation to show what exactly you are trying to simulate.
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