# \#faq **URL:** https://precice.discourse.group/tag/faq/10.md [Latest](https://precice.discourse.group/latest.md) · [Categories](https://precice.discourse.group/categories.md) · [Tags](https://precice.discourse.group/tags.md) --- ## [What are best practices to write a new adapter?](https://precice.discourse.group/t/what-are-best-practices-to-write-a-new-adapter/44)
**Author:** [@uekerman](https://precice.discourse.group/u/uekerman)\ **Replies:** 2\ **Last updated:** [January 3, 2026, 1:02pm UTC](https://precice.discourse.group/t/what-are-best-practices-to-write-a-new-adapter/44 "2026-01-03T13:02:38Z")
Alex started a good discussion on the mailing list (May 3, 2019) about best practices when writing a new adapter: I wanted to ask if there are some additional guidelines on how to write good adapters for preCICE. I have… --- ## [Can preCICE be used for volume coupling?](https://precice.discourse.group/t/can-precice-be-used-for-volume-coupling/27)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 8\ **Last updated:** [August 11, 2025, 1:12pm UTC](https://precice.discourse.group/t/can-precice-be-used-for-volume-coupling/27 "2025-08-11T13:12:45Z")
I read that you do surface coupling? Do you support volume coupling too? --- ## [Restarting coupled FSI simulation with preCICE](https://precice.discourse.group/t/restarting-coupled-fsi-simulation-with-precice/117)
**Author:** [@ksripathy](https://precice.discourse.group/u/ksripathy)\ **Replies:** 10\ **Last updated:** [July 3, 2024, 3:56pm UTC](https://precice.discourse.group/t/restarting-coupled-fsi-simulation-with-precice/117 "2024-07-03T15:56:51Z")
Dear all, I am trying to validate my fluid and structure mesh for the FSI1 case of cylinder-flap test. As the refinement of the fluid and structure mesh increases, it is difficult for implicit FSI coupling to converge. … --- ## [Can preCICE be used with moving meshes?](https://precice.discourse.group/t/can-precice-be-used-with-moving-meshes/53)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 28\ **Last updated:** [June 6, 2024, 2:01am UTC](https://precice.discourse.group/t/can-precice-be-used-with-moving-meshes/53 "2024-06-06T02:01:13Z")
What happens when the interface is moving? --- ## [How to configure preCICE communication on kubernetes with TCP port access control?](https://precice.discourse.group/t/how-to-configure-precice-communication-on-kubernetes-with-tcp-port-access-control/1451)
**Author:** [@ostodieck](https://precice.discourse.group/u/ostodieck)\ **Replies:** 2\ **Last updated:** [May 16, 2024, 8:23am UTC](https://precice.discourse.group/t/how-to-configure-precice-communication-on-kubernetes-with-tcp-port-access-control/1451 "2024-05-16T08:23:45Z")
I am trying to replicate the Perpendicular Flap example on a k8s cloud that uses an istio service mesh. I am running OpenFOAM with the preCICE adapter in one pod and Calculix with the preCICE adapter in another pod in th… --- ## [Is there a cmake module FindpreCICE.cmake?](https://precice.discourse.group/t/is-there-a-cmake-module-findprecice-cmake/37)
**Author:** [@uekerman](https://precice.discourse.group/u/uekerman)\ **Replies:** 1\ **Last updated:** [October 8, 2019, 10:04am UTC](https://precice.discourse.group/t/is-there-a-cmake-module-findprecice-cmake/37 "2019-10-08T10:04:58Z")
Let’s say a group builds their in-house code with cmake and they link all their external dependencies via cmake modules, a natural question would be: is there also such a thing for preCICE? --- ## [Can preCICE be used with GPUs or other accelerator cards?](https://precice.discourse.group/t/can-precice-be-used-with-gpus-or-other-accelerator-cards/822)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 4\ **Last updated:** [May 10, 2023, 3:52pm UTC](https://precice.discourse.group/t/can-precice-be-used-with-gpus-or-other-accelerator-cards/822 "2023-05-10T15:52:06Z")
My target system features GPUs or other accelerator cards. Can preCICE use them to accelerate the simulation? --- ## [How do I cite preCICE?](https://precice.discourse.group/t/how-do-i-cite-precice/32)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 2\ **Last updated:** [May 10, 2023, 2:05pm UTC](https://precice.discourse.group/t/how-do-i-cite-precice/32 "2023-05-10T14:05:11Z")
I used preCICE in my research and want to cite it. What citation should I use? --- ## [Where can I find published literature related to preCICE?](https://precice.discourse.group/t/where-can-i-find-published-literature-related-to-precice/30)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 1\ **Last updated:** [October 8, 2019, 12:14pm UTC](https://precice.discourse.group/t/where-can-i-find-published-literature-related-to-precice/30 "2019-10-08T12:14:44Z")
I am interested in what has been published related to preCICE. Where can I find more information on the academic side of the project? --- ## [How to debug the OpenFOAM adapter?](https://precice.discourse.group/t/how-to-debug-the-openfoam-adapter/815)
**Author:** [@Alphaoo1](https://precice.discourse.group/u/Alphaoo1)\ **Replies:** 6\ **Last updated:** [December 8, 2021, 5:37pm UTC](https://precice.discourse.group/t/how-to-debug-the-openfoam-adapter/815 "2021-12-08T17:37:49Z")
Hello preCICE community, I am opening this topic in the hopes of following: It works as guidance for future developers working on OF adapters Getting help on debugging OpenFOAM adapter or OF related things My System: … --- ## [How can I restart a coupled simulation?](https://precice.discourse.group/t/how-can-i-restart-a-coupled-simulation/675)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [July 29, 2021, 1:31pm UTC](https://precice.discourse.group/t/how-can-i-restart-a-coupled-simulation/675 "2021-07-29T13:31:08Z")
Common question: “My simulation crashed after hours of running, but my solvers already has stored restart files. Do I need to do anything special in preCICE?” --- ## [Help! The participants are not finding each other!](https://precice.discourse.group/t/help-the-participants-are-not-finding-each-other/646)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 2\ **Last updated:** [June 30, 2021, 7:59pm UTC](https://precice.discourse.group/t/help-the-participants-are-not-finding-each-other/646 "2021-06-30T19:59:41Z")
A possible situation, without an error: one or both/multiple participants display the message Setting up master communication to coupling partner/s and nothing happens, even though this step should complete instantaneo… --- ## [3D - 1D coupling](https://precice.discourse.group/t/3d-1d-coupling/388)
**Author:** [@chi86](https://precice.discourse.group/u/chi86)\ **Replies:** 2\ **Last updated:** [November 13, 2020, 8:51am UTC](https://precice.discourse.group/t/3d-1d-coupling/388 "2020-11-13T08:51:54Z")
Hi! is there a way to couple a 1D simulation (OpenModelica) with a 3D simulation (OpenFoam)? thx --- ## [Can preCICE be used for one-way coupling?](https://precice.discourse.group/t/can-precice-be-used-for-one-way-coupling/28)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 2\ **Last updated:** [April 27, 2020, 10:58am UTC](https://precice.discourse.group/t/can-precice-be-used-for-one-way-coupling/28 "2020-04-27T10:58:40Z")
Can I couple two participants one-way? --- ## [How can I use preCICE with a non-default MPI implementation?](https://precice.discourse.group/t/how-can-i-use-precice-with-a-non-default-mpi-implementation/35)
**Author:** [@gilbertolem](https://precice.discourse.group/u/gilbertolem)\ **Replies:** 2\ **Last updated:** [October 24, 2019, 2:28pm UTC](https://precice.discourse.group/t/how-can-i-use-precice-with-a-non-default-mpi-implementation/35 "2019-10-24T14:28:22Z")
When I build preCICE, it uses the default MPI implementation. How could I use e.g. MPICH? --- ## [Does preCICE support Python 2?](https://precice.discourse.group/t/does-precice-support-python-2/58)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 2\ **Last updated:** [October 21, 2019, 1:53pm UTC](https://precice.discourse.group/t/does-precice-support-python-2/58 "2019-10-21T13:53:34Z")
If my code is written in Python 2, do I still have a chance to use preCICE (even an older version), now that the clock is ticking? --- ## [Why should I pick preCICE over other coupling software?](https://precice.discourse.group/t/why-should-i-pick-precice-over-other-coupling-software/31)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 3\ **Last updated:** [October 14, 2019, 8:32pm UTC](https://precice.discourse.group/t/why-should-i-pick-precice-over-other-coupling-software/31 "2019-10-14T20:32:18Z")
There are many other coupling solutions out there. Many research groups write their custom coupling framework. Why should I use preCICE? --- ## [How is preCICE funded?](https://precice.discourse.group/t/how-is-precice-funded/51)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 12:27pm UTC](https://precice.discourse.group/t/how-is-precice-funded/51 "2019-10-14T12:27:31Z")
Is preCICE indeed free software, or is it too good to be true? --- ## [Can preCICE interpolate between unstructured and structured meshes?](https://precice.discourse.group/t/can-precice-interpolate-between-unstructured-and-structured-meshes/56)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 12:37pm UTC](https://precice.discourse.group/t/can-precice-interpolate-between-unstructured-and-structured-meshes/56 "2019-10-14T12:37:54Z")
Or: Can preCICE interpolate between an arbitrary / unstructured mesh and a regular / structured mesh? --- ## [Does partitioned coupling introduce error?](https://precice.discourse.group/t/does-partitioned-coupling-introduce-error/55)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 12:36pm UTC](https://precice.discourse.group/t/does-partitioned-coupling-introduce-error/55 "2019-10-14T12:36:26Z")
I always hear that monolithic coupling is the only way to go, as partitioned coupling introduces error. Is this correct? --- ## [Can the individual solvers run on two different machines?](https://precice.discourse.group/t/can-the-individual-solvers-run-on-two-different-machines/54)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 12:34pm UTC](https://precice.discourse.group/t/can-the-individual-solvers-run-on-two-different-machines/54 "2019-10-14T12:34:37Z")
Can the individual solvers run on two different platforms on two different machines in/out of a network? --- ## [Which code drives the coupled simulation in preCICE?](https://precice.discourse.group/t/which-code-drives-the-coupled-simulation-in-precice/52)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 12:29pm UTC](https://precice.discourse.group/t/which-code-drives-the-coupled-simulation-in-precice/52 "2019-10-14T12:29:17Z")
Which code is executing the coupling iterations given that preCICE does not really have a centralized engine to orchestrate the simulation? --- ## [Do you test preCICE?](https://precice.discourse.group/t/do-you-test-precice/26)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 12:18pm UTC](https://precice.discourse.group/t/do-you-test-precice/26 "2019-10-14T12:18:09Z")
How do you test preCICE and its official adapters? Can I trust you? --- ## [Which OpenFOAM versions are supported?](https://precice.discourse.group/t/which-openfoam-versions-are-supported/50)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [October 13, 2019, 7:19pm UTC](https://precice.discourse.group/t/which-openfoam-versions-are-supported/50 "2019-10-13T19:19:48Z")
There are multiple OpenFOAM “variants”, including openfoam.com, openfoam.org, and the early fork foam-extend. Which versions of them are compatible? --- ## [How can preCICE interpolate between different timestep sizes?](https://precice.discourse.group/t/how-can-precice-interpolate-between-different-timestep-sizes/43)
**Author:** [@uekerman](https://precice.discourse.group/u/uekerman)\ **Replies:** 2\ **Last updated:** [October 13, 2019, 6:53pm UTC](https://precice.discourse.group/t/how-can-precice-interpolate-between-different-timestep-sizes/43 "2019-10-13T18:53:06Z")
Marta asked on the mailing list (March 28, 2019) I’m using preCICE to couple two codes: the lattice Boltzmann code LUMIS and OpenFOAM. LUMIS has a time step 10 times smaller than OpenFOAM so during the coupling LUMIS s… --- ## [Can preCICE be used with adaptive meshes?](https://precice.discourse.group/t/can-precice-be-used-with-adaptive-meshes/29)
**Author:** [@fsimonis](https://precice.discourse.group/u/fsimonis)\ **Replies:** 1\ **Last updated:** [October 8, 2019, 12:19pm UTC](https://precice.discourse.group/t/can-precice-be-used-with-adaptive-meshes/29 "2019-10-08T12:19:14Z")
My solver offers adaptive mesh refinement. Can I use this with preCICE? --- ## [I was asked to try a Pull Request. How can I do that?](https://precice.discourse.group/t/i-was-asked-to-try-a-pull-request-how-can-i-do-that/38)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 2\ **Last updated:** [October 12, 2019, 12:41pm UTC](https://precice.discourse.group/t/i-was-asked-to-try-a-pull-request-how-can-i-do-that/38 "2019-10-12T12:41:38Z")
A preCICE developer told me to try a “PR” (Pull Request). What is this and how do I try it? --- ## [How does preCICE handle data mapping for non-matching domain decompositions?](https://precice.discourse.group/t/how-does-precice-handle-data-mapping-for-non-matching-domain-decompositions/42)
**Author:** [@uekerman](https://precice.discourse.group/u/uekerman)\ **Replies:** 6\ **Last updated:** [October 10, 2019, 7:40pm UTC](https://precice.discourse.group/t/how-does-precice-handle-data-mapping-for-non-matching-domain-decompositions/42 "2019-10-10T19:40:04Z")
We had a good discussion with Satish on the mailing list about the re-partitioning process and the connection to parallel data mapping in preCICE. Satish asked (July 24, 2019): It seems to me that mappings can occur i… --- ## [Which data mapping method should I use for large deformations?](https://precice.discourse.group/t/which-data-mapping-method-should-i-use-for-large-deformations/41)
**Author:** [@uekerman](https://precice.discourse.group/u/uekerman)\ **Replies:** 1\ **Last updated:** [October 10, 2019, 7:23pm UTC](https://precice.discourse.group/t/which-data-mapping-method-should-i-use-for-large-deformations/41 "2019-10-10T19:23:13Z")
Nikrouz asked on the mailing list (Sep 13, 2019): I am going to use OpenFoam-CalculiX for FSI simulations. At this time, I am have technical question for preparing preCICE config file. The case I am going to run has v… --- ## [Does the OpenFOAM adapter support implicit coupling?](https://precice.discourse.group/t/does-the-openfoam-adapter-support-implicit-coupling/36)
**Author:** [@Makis](https://precice.discourse.group/u/Makis)\ **Replies:** 1\ **Last updated:** [October 8, 2019, 12:34pm UTC](https://precice.discourse.group/t/does-the-openfoam-adapter-support-implicit-coupling/36 "2019-10-08T12:34:53Z")
The OpenFOAM adapter has the form of an OpenFOAM function object. This mechanism is commonly used only for post-processing, so a reasonable question is: Does the OpenFOAM adapter also take care of the checkpointing? In… [Next page](https://precice.discourse.group/tag/faq/10.md?match_all_tags=true&page=1&tags%5B%5D=faq)