OCN-SIM FLEX v0.2 Released

Today, OCN-SIM FLEX received a major update.  I merged in almost 3 months of work from my pri­vate devel­op­ment repo and con­sid­ered the changes mean­ing­ful enough to take the leap from v0.1.3 to v0.2.

Major changes include:

  • Abil­i­ty to import raw data in addi­tion to gen­er­at­ing data based on rope sys­tem files
  • New load­case to illus­trate raw data import capa­bil­i­ty: rawData__rhombicNetting
  • New exam­ple load­case otterBoard
  • Lots of changes in inter­nal data struc­tures mak­ing life eas­i­er for pro­gram­mers (hope­ful­ly!)
  • Imple­ment­ed merge node fea­ture for RRF solvers (hard­cod­ed boolean paramter).
    Nodes in sec­ondary con­straints can now be merged to one node lead­ing to a numerically
    equal treat­ment of both pri­ma­ry and sec­ondary constraints.
  • Intro­duc­ing com­po­nent-wise PID force ele­ments. These can serve e.g. as a sub­sti­tute for
    the for­mer­ly used spring ele­ments to cou­ple rigid bod­ies to the rest of the sys­tem. Can be
    used as spring/damper com­bi­na­tions as well by set­ting inte­gral con­stant to zero.

I love Fridays.

>>> christoph

otter­Board: Otter­boards spread­ing towed ropes (tow direc­tion indi­cat­ed by arrow)


OCN-SIM FLEX now has it's own wiki. Go check it out on


New Primer on Postprocessing Available

I recent­ly added a new primer on OCN-SIM FLEX posprocessing


Also, check the updat­ed full doc­u­men­ta­tion on


Pospro­cess­ing in Paraview

OCN-SIM FLEX v0.1.3 Released

OCN-SIM Flex v0.1.3 is ready for down­load. There's lot's of new fea­tures to explore, so go grab yours now on


Major changes:

  • Intro­duc­ing par­tial­ly sub­merged, slen­der cylin­dri­cal buoys
  • Intro­duc­ing lin­ear airy wave theory
  • Out­put water sur­face ele­va­tion at select­ed points
  • Lots of mis­cel­la­neous small­er changes, com­pare com­mit log
  • More exam­ple loadcases
Buoy in a liearised wave field

OCN-SIM FLEX v0.1.2 Released

I've just released OCN-SIM Flex v0.1.2. There's lot's of new fea­tures to explore, so go grab yours now on


Changes include:

  • Cal­cu­la­tion of inter­nal forces
  • New con­fig­u­ra­tion file for­mat — .ini con­form­ing sec­tions. If your edi­tor sup­ports it: Go for code folding!
  • Basic sup­port for hydro­foils (unfor­tu­nate­ly I did not yet include any exem­plary coef­f­cient files)
Exam­ple sys­tem of floaters
Caten­ray line

OCN-SIM FLEX v0.1.1 Released

After hav­ing had quite a busy time writ­ing  my Ph.D. the­sis, I final­ly man­aged to incor­po­rate some new changes into OCN-SIM Flex that are mean­ing­ful enough to tag this with a new ver­sion.  This main­ly includes the fol­low­ing changes:

  • Intro­duced sub­sti­tu­tion vari­ables as a com­fort­able way to define val­ues occur­ring sev­er­al times in an input file
  • Main­ly changes under the hood to make life a lit­tle eas­i­er for developers

More­over, there's lots of algo­rithms and fea­tures that are still unpub­lished, but which will find their way into this repo, once they are prop­er­ly eval­u­at­ed and reviewed. Amongst oth­ers, this is going to include the eval­u­a­tion of inter­nal reac­tion forces as to be seen in the demo pic­ture. So just drop by from time to time and see what's new.

Greet­ings from the scriptorium,


OCN-SIM FLEX v0.1 Alpha Release

Dear All,

after count­less hours of work, I am glad to announce the first release of a devel­op­er pre­view of the sim­u­la­tion toolk­it OCN-SIM FLEX — a tool for the approx­i­mate dynam­ic sim­u­la­tion of ful­ly sub­merged flex­i­ble mar­itime struc­tures (e.g. moor­ings, buoys, towed vehi­cles, nets and fish­ing gear). The asso­ci­at­ed user man­u­al is released as part of OCN-ED and con­tains the doc­u­men­ta­tion of the actu­al soft­ware as well as a the­o­ry ref­er­ence con­cern­ing ide­al­ly flex­i­ble mar­itime structures.

Down­load the tool and the doc­u­men­ta­tion source from GitLab:



You can also down­load the man­u­al in pdf for­mat directly.

>>> christoph

Under Construction

This web­site is still under con­struc­tion. Thank you very much for your patience.

>>> christoph