  We consider the Bohmian trajectories in a 2-d quantum harmonic oscillator
with non commensurable frequencies whose wavefunction is of the form
$\Psi=a\Psi_{m_1,n_1}(x,y)+b\Psi_{m_2,n_2}(x,y)+c\Psi_{m_3,n_3}(x,y)$. We first
find the trajectories of the nodal points for different combinations of the
quantum numbers $m,n$. Then we study, in detail, a case with relatively large
quantum numbers and two equal $m's$. We find %We find first the nodal points
where $\Psi=0$. The nodes can be found analytically only if $m$ and $n$ are
small. If two $m's$ (or two $n's$ are equal we can find explicitly the nodal
points , which are of two types (1) fixed nodes independent of time and (2)
moving nodes which from time to time collide with the fixed nodes and at
particular times they go to infinity.
  Finally, we study the trajectories of quantum particles close to the nodal
points and observe, for the first time, how chaos is generated in a complex
system with multiple nodes scattered on the configuration space.
