What projects am I part of and what is my default account?

In order to find out what projects you are part of on the clusters then you can use the Sproject tool:

$ Sproject 

The user ulambda ( Ursula Lambda ) is in the following project accounts
  
   ulambda_default
   ulambda_etivaz
   ulambda_gruyere
 
Their default account is: ulambda_default

If Sproject is called without any arguments then it tells you what projects/accounts you are in. 

To find out what projects other users are in you can call Sproject with the -u option

$ Sproject -u nosuchuser

The user nosuchuser ( I really do not exist ) is in the following project accounts
..
..