Dear Colleague,

A number of bugs in the Dissipative Particle Dynamics (DPD) and Lattice 
Boltzmann Equation (LBE) codes in DL_MESO 2.5 have been discovered.

Three bugs have been found in the DPD code:

1. A division-by-zero error occurs if a new system without unbonded particles is 
   specified.
2. The positions of molecules are assigned incorrectly when reading CONFIG 
   files.
3. Incorrect molecule types are assigned to particles when reading CONFIG files.

Many thanks are due to Thomas Rodgers (Durham University) and Simão Pereira 
(University of Trieste) for spotting and reporting these bugs.

One bug has been found in the LBE code: if the Boussinesq reference temperatures 
are not specified, calculation of the Boussinesq forces (applied for systems 
with temperature grids) will result in division-by-zero errors.

In addition to fixes for the above bugs, the following additional changes have 
been made to the downloadable version of the package:

* Parallel particle deport routines (in DPD) are now independent of boundary 
  halo size
* Additional error checks are included in the utility molecule-generate.cpp
* The 2D_LidCavity test case has been revised to use incompressible fluid
* The option to open input files (lbin.sys or CONTROL) in the Java GUI and 
  changes to default/suggested values for particular parameters
* Revisions to the user manual

The revised version of DL_MESO can now be downloaded and decrypted using the 
same procedure as outlined in the original instructions emailed to registered 
users. Re-registration is not necessary if you are a current DL_MESO version 2.5 
user.

Michael Seaton
2012-04-27