# Fluid Flow / CFD **URL:** https://www.simscale.com/forum/c/using-simscale/cfd/11.md?page=1 [Latest](https://www.simscale.com/forum/latest.md) · [Categories](https://www.simscale.com/forum/categories.md) **Page:** 2 --- ## [Help working with Conjugate Heat Transfer for solar dryer](https://www.simscale.com/forum/t/help-working-with-conjugate-heat-transfer-for-solar-dryer/100705)
**Author:** [@KenyaTeam](https://www.simscale.com/forum/u/KenyaTeam)\ **Replies:** 1\ **Last updated:** [February 26, 2026, 10:26pm UTC](https://www.simscale.com/forum/t/help-working-with-conjugate-heat-transfer-for-solar-dryer/100705 "2026-02-26T22:26:11Z")
Hi everyone, I’m working on a student project where we want to simulate temperature, humidity, and airflow inside a solar dryer using SimScale, to compare different design setups (e.g. passive ventilation, turbine roof … --- ## [How to determine reference area for submarine drag coefficient?](https://www.simscale.com/forum/t/how-to-determine-reference-area-for-submarine-drag-coefficient/98199)
**Author:** [@MassimoDCCC](https://www.simscale.com/forum/u/MassimoDCCC)\ **Replies:** 6\ **Last updated:** [February 24, 2026, 9:54pm UTC](https://www.simscale.com/forum/t/how-to-determine-reference-area-for-submarine-drag-coefficient/98199 "2026-02-24T21:54:34Z")
I’m trying to find the drag coefficient of a submarine model I made from a frontal orientation, so I set up the simulation accordingly and then got to work with the moments and forces coefficient module. However, after c… --- ## [Simulation run failed](https://www.simscale.com/forum/t/simulation-run-failed/100765)
**Author:** [@Kirtisingh](https://www.simscale.com/forum/u/Kirtisingh)\ **Replies:** 1\ **Last updated:** [February 20, 2026, 10:22pm UTC](https://www.simscale.com/forum/t/simulation-run-failed/100765 "2026-02-20T22:22:31Z")
I am getting this message on running my simulation. “Gauge pressure field started diverging to a value of 4.66023e+16 Pa near the position: (3.173e-4, -1.199e-1, 4.014e-5). Please check the mesh quality near the reported… --- ## [Horizontally homogeneous/constant in empty computational domain](https://www.simscale.com/forum/t/horizontally-homogeneous-constant-in-empty-computational-domain/100096)
**Author:** [@nl\_victor\_reij](https://www.simscale.com/forum/u/nl_victor_reij)\ **Replies:** 5\ **Last updated:** [February 20, 2026, 12:27pm UTC](https://www.simscale.com/forum/t/horizontally-homogeneous-constant-in-empty-computational-domain/100096 "2026-02-20T12:27:54Z")
According to Blocken (https://pure.tue.nl/ws/files/7993534/687442152079717.pdf, section 5.7) one needs to check if one’s empty computational domain (but using the correct roughnes length \[inlet) and roughness height \[for… --- ## [Error : Found 1 body only assigned to advanced concepts and not interfering with any body assigned to a material: Cylinder. Check your advanced concept and material assignments or the CAD model.](https://www.simscale.com/forum/t/error-found-1-body-only-assigned-to-advanced-concepts-and-not-interfering-with-any-body-assigned-to-a-material-cylinder-check-your-advanced-concept-and-material-assignments-or-the-cad-model/100657)
**Author:** [@YOYO21](https://www.simscale.com/forum/u/YOYO21)\ **Replies:** 1\ **Last updated:** [January 12, 2026, 6:57pm UTC](https://www.simscale.com/forum/t/error-found-1-body-only-assigned-to-advanced-concepts-and-not-interfering-with-any-body-assigned-to-a-material-cylinder-check-your-advanced-concept-and-material-assignments-or-the-cad-model/100657 "2026-01-12T18:57:23Z")
I am currently facing an error that I don’t know how to solve … This error suggests that there is a problem with my cylinder , but as far as I know I did all the necessary to correctly prepare my CAD to the CFD sim… --- ## [Using log function for velocity](https://www.simscale.com/forum/t/using-log-function-for-velocity/36704)
**Author:** [@ajaybharish](https://www.simscale.com/forum/u/ajaybharish)\ **Replies:** 5\ **Last updated:** [December 9, 2025, 2:51pm UTC](https://www.simscale.com/forum/t/using-log-function-for-velocity/36704 "2025-12-09T14:51:50Z")
Hello, When I define inlet velocities, I can use several functions like sin, cos, log etc. So here is this log referring to Log-to-base-10 or to-base-e? I would assume that it is natural logarithm but log-to-base-10 … --- ## [Modelling a single steady state rotating domain](https://www.simscale.com/forum/t/modelling-a-single-steady-state-rotating-domain/88457)
**Author:** [@mshorter](https://www.simscale.com/forum/u/mshorter)\ **Replies:** 3\ **Last updated:** [December 5, 2025, 12:54am UTC](https://www.simscale.com/forum/t/modelling-a-single-steady-state-rotating-domain/88457 "2025-12-05T00:54:54Z")
My notional problem (SimScale ) is a circular pipe along the z axis, with the inlet centered at the origin, diameter 0.1m, length 1m with uniform rotation. The body rotates about the x axis, with the axis located at the… --- ## [error when importing](https://www.simscale.com/forum/t/error-when-importing/100548)
**Author:** [@Mudonja](https://www.simscale.com/forum/u/Mudonja)\ **Replies:** 1\ **Last updated:** [December 1, 2025, 12:19am UTC](https://www.simscale.com/forum/t/error-when-importing/100548 "2025-12-01T00:19:04Z")
when i try to import a step file into a project it just says an unexpected error ocurred please contact support for assistance --- ## [CFD help wing analysis](https://www.simscale.com/forum/t/cfd-help-wing-analysis/100540)
**Author:** [@miki\_the\_aero](https://www.simscale.com/forum/u/miki_the_aero)\ **Replies:** 0\ **Last updated:** [November 18, 2025, 5:13pm UTC](https://www.simscale.com/forum/t/cfd-help-wing-analysis/100540 "2025-11-18T17:13:03Z")
We’re currently designing and building VTOLs, and I’m trying to validate my wing design. I created a general wing model in XFLR5, and I want to compare the results to those I’m getting in my CFD setup. I’m running an inc… --- ## [Recreating M = 2 wedge flow](https://www.simscale.com/forum/t/recreating-m-2-wedge-flow/100504)
**Author:** [@lelandswimsz](https://www.simscale.com/forum/u/lelandswimsz)\ **Replies:** 2\ **Last updated:** [November 7, 2025, 11:41am UTC](https://www.simscale.com/forum/t/recreating-m-2-wedge-flow/100504 "2025-11-07T11:41:26Z")
I am trying to recreate this tutorial: The tutorial uses “Multi-Purpose”, but I am trying to use “Compressible”. I created the CAD externally and imported it. I noticed some differences in settings. For example, for t… --- ## [Perforated spiral duct](https://www.simscale.com/forum/t/perforated-spiral-duct/100454)
**Author:** [@brenthom](https://www.simscale.com/forum/u/brenthom)\ **Replies:** 1\ **Last updated:** [October 10, 2025, 9:35pm UTC](https://www.simscale.com/forum/t/perforated-spiral-duct/100454 "2025-10-10T21:35:22Z")
Hello everyone, I am looking for a way to simulate a perforated spiral duct. The duct is used as a supply air outlet in a ventilation system. The holes are evenly distributed around the circumference of the duct. As the… --- ## [Condensation simulation](https://www.simscale.com/forum/t/condensation-simulation/100281)
**Author:** [@jaat0003](https://www.simscale.com/forum/u/jaat0003)\ **Replies:** 1\ **Last updated:** [October 2, 2025, 11:41am UTC](https://www.simscale.com/forum/t/condensation-simulation/100281 "2025-10-02T11:41:23Z")
Hi all, I am trying to create a condensation/decondensation simulation. I created a simulation using Conjugate Heat Transfer v2.0 that should reproduce this phenomenon. The relative humidity value on the surface is 100%… --- ## [Simulation of hydrostatic pressure in tank](https://www.simscale.com/forum/t/simulation-of-hydrostatic-pressure-in-tank/100398)
**Author:** [@Ryma](https://www.simscale.com/forum/u/Ryma)\ **Replies:** 1\ **Last updated:** [September 15, 2025, 3:58pm UTC](https://www.simscale.com/forum/t/simulation-of-hydrostatic-pressure-in-tank/100398 "2025-09-15T15:58:08Z")
I want to simulate the hydrostatic pressure in tank I can’t do this. can you make for me a video step by step --- ## [Cfd-FSI-2 Way](https://www.simscale.com/forum/t/cfd-fsi-2-way/100349)
**Author:** [@davidsamuelvsr](https://www.simscale.com/forum/u/davidsamuelvsr)\ **Replies:** 1\ **Last updated:** [September 9, 2025, 6:26pm UTC](https://www.simscale.com/forum/t/cfd-fsi-2-way/100349 "2025-09-09T18:26:58Z")
Is it possible to do CFD 2 way Fsi on Wave Energy converter in simscale cloud? Can someone guide me. --- ## [I'm having a problem with a CFD simulation.](https://www.simscale.com/forum/t/im-having-a-problem-with-a-cfd-simulation/100341)
**Author:** [@manuelrivera44](https://www.simscale.com/forum/u/manuelrivera44)\ **Replies:** 1\ **Last updated:** [August 25, 2025, 1:27pm UTC](https://www.simscale.com/forum/t/im-having-a-problem-with-a-cfd-simulation/100341 "2025-08-25T13:27:34Z")
When I follow all the steps to create the simulation, I get an error at the end: (Make sure all CAD entities are assigned a subject or advanced concepts are missing for the following entities.) Could someone help me? --- ## [I need help with my SimScale project](https://www.simscale.com/forum/t/i-need-help-with-my-simscale-project/100322)
**Author:** [@rosamaria](https://www.simscale.com/forum/u/rosamaria)\ **Replies:** 1\ **Last updated:** [August 19, 2025, 11:33am UTC](https://www.simscale.com/forum/t/i-need-help-with-my-simscale-project/100322 "2025-08-19T11:33:02Z")
SimScale at the Mesh point, when I click generate, it does not run and displays a message saying ‘The configuration has errors.’ I have checked the parameters over and over again and they are correct, or everything looks… --- ## [Unable to get the flow region in simulation for an assembly](https://www.simscale.com/forum/t/unable-to-get-the-flow-region-in-simulation-for-an-assembly/100261)
**Author:** [@farazalam2004](https://www.simscale.com/forum/u/farazalam2004)\ **Replies:** 3\ **Last updated:** [August 7, 2025, 2:23pm UTC](https://www.simscale.com/forum/t/unable-to-get-the-flow-region-in-simulation-for-an-assembly/100261 "2025-08-07T14:23:36Z")
Once I create a flow region for my model by adding an external volume and then subtracting the body out of it, I proceed to simulation. But the flow region disappears, and I can’t use it for setting the material or bound… --- ## [Multiple regions in single-region analysis type](https://www.simscale.com/forum/t/multiple-regions-in-single-region-analysis-type/100260)
**Author:** [@norrisz](https://www.simscale.com/forum/u/norrisz)\ **Replies:** 1\ **Last updated:** [July 28, 2025, 1:09pm UTC](https://www.simscale.com/forum/t/multiple-regions-in-single-region-analysis-type/100260 "2025-07-28T13:09:21Z")
hi there, i have some problem when doing mesh. it keep couldnt start job because “A setup with multiple regions is being used in a single-region analysis type. Please ensure that only one region is assigned to the mater… --- ## [Comparing SimScale with desktop OpenFOAM results.](https://www.simscale.com/forum/t/comparing-simscale-with-desktop-openfoam-results/100111)
**Author:** [@nl\_victor\_reij](https://www.simscale.com/forum/u/nl_victor_reij)\ **Replies:** 0\ **Last updated:** [May 29, 2025, 12:53pm UTC](https://www.simscale.com/forum/t/comparing-simscale-with-desktop-openfoam-results/100111 "2025-05-29T12:53:38Z")
Hello all of you, A collegue and me are working on the same model: I use SimScale and my collegue uses his own desktop based OpenFOAM system. We are looking at a simple model: a bock of 10x10x10m. Here is my SimScale … --- ## [Velocity Magnitude (Unrealistically High)](https://www.simscale.com/forum/t/velocity-magnitude-unrealistically-high/100044)
**Author:** [@tpinol](https://www.simscale.com/forum/u/tpinol)\ **Replies:** 1\ **Last updated:** [May 8, 2025, 2:32pm UTC](https://www.simscale.com/forum/t/velocity-magnitude-unrealistically-high/100044 "2025-05-08T14:32:09Z")
Hi, I’m modelling the piston of a medical device compressing air inside a vented chamber and I’ve run into a puzzling result that I’d appreciate your thoughts on: Intial Volume = 846.000 𝑚𝑚^3 Final Volume = 182.400 𝑚𝑚… --- ## [Incompressible Fluid Flow Mesh Error](https://www.simscale.com/forum/t/incompressible-fluid-flow-mesh-error/99986)
**Author:** [@gkerner002](https://www.simscale.com/forum/u/gkerner002)\ **Replies:** 4\ **Last updated:** [April 16, 2025, 12:43am UTC](https://www.simscale.com/forum/t/incompressible-fluid-flow-mesh-error/99986 "2025-04-16T00:43:16Z")
I keep getting errors with my mesh saying my small feature suppression is too large so then I would decrease it and then it would say it is too fine. If I could get some help with my model that would be awesome. I am wor… --- ## [Starting simulation for test pump](https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838)
**Author:** [@GoldenDragonfly](https://www.simscale.com/forum/u/GoldenDragonfly)\ **Replies:** 3\ **Last updated:** [April 2, 2025, 10:08pm UTC](https://www.simscale.com/forum/t/starting-simulation-for-test-pump/99838 "2025-04-02T22:08:15Z")
I want to simulate a simple a simple tube that is under constant pressure, as well as has a component that moves to draw fluid into the barrel from (0 \ **Author:** [@guido\_putignan](https://www.simscale.com/forum/u/guido_putignan)\ **Replies:** 3\ **Last updated:** [April 2, 2025, 9:39am UTC](https://www.simscale.com/forum/t/ic-vad-simulation-flow/99947 "2025-04-02T09:39:46Z") Hi, I have a problem. I developed a VAD model on Fusion 360. In this case, the IC VAD Model was like the picture described here. However, when I put it in SimScale, I find it difficult to obtain the face for the vel… --- ## [Airflow in room - heating radiator](https://www.simscale.com/forum/t/airflow-in-room-heating-radiator/99941)
**Author:** [@Luksajetop10](https://www.simscale.com/forum/u/Luksajetop10)\ **Replies:** 1\ **Last updated:** [March 24, 2025, 9:30pm UTC](https://www.simscale.com/forum/t/airflow-in-room-heating-radiator/99941 "2025-03-24T21:30:16Z")
https://ctrlv.cz/CHWs Hi. I need help with the simulation. I wanted to simulate the air flow in the room - 2 pipes will be the air supply. 1 pipe will be the pressure out. I made the internal air volume and then remove… --- ## [Mesh error](https://www.simscale.com/forum/t/mesh-error/99889)
**Author:** [@lots\_mel](https://www.simscale.com/forum/u/lots_mel)\ **Replies:** 3\ **Last updated:** [March 24, 2025, 9:21pm UTC](https://www.simscale.com/forum/t/mesh-error/99889 "2025-03-24T21:21:14Z")
The simulations are for academic purposes, but I’m having a lot of difficulty because they don’t show any results. Now I’m having problems with the mesh, it showed an error during the run. (https://www.simscale.com/… --- ## [Determine flow rate of a bathtub overflow](https://www.simscale.com/forum/t/determine-flow-rate-of-a-bathtub-overflow/99891)
**Author:** [@MrTomB](https://www.simscale.com/forum/u/MrTomB)\ **Replies:** 1\ **Last updated:** [March 19, 2025, 2:28pm UTC](https://www.simscale.com/forum/t/determine-flow-rate-of-a-bathtub-overflow/99891 "2025-03-19T14:28:46Z")
Hi. I need to understand the value of the flow rate of a bathtub overflow for a uni project. It comes from a EN standard I have to basically keep increasing the inlet flow rate until the water level is stable indicating … --- ## [Air flow simulation in server](https://www.simscale.com/forum/t/air-flow-simulation-in-server/99899)
**Author:** [@mshirsikar](https://www.simscale.com/forum/u/mshirsikar)\ **Replies:** 1\ **Last updated:** [March 19, 2025, 2:14pm UTC](https://www.simscale.com/forum/t/air-flow-simulation-in-server/99899 "2025-03-19T14:14:25Z")
hi i am using simscale for air flow analysis in server but i am stucked in simulation step i want to flow air through server and reduce the temp of processors . but the error said that electric matrial or properties ad… --- ## [Help with simulation](https://www.simscale.com/forum/t/help-with-simulation/99887)
**Author:** [@Luksajetop10](https://www.simscale.com/forum/u/Luksajetop10)\ **Replies:** 1\ **Last updated:** [March 17, 2025, 9:44pm UTC](https://www.simscale.com/forum/t/help-with-simulation/99887 "2025-03-17T21:44:01Z")
Hello, I’m new and have been working with SimScale for a while and I need some help. I created a 3D model in Revit - simple 4 walls, floor and 2 pipes. I made an internal air space. → I assigned a material to the in… --- ## [Liquid Reference Pressure in the cavitation model](https://www.simscale.com/forum/t/liquid-reference-pressure-in-the-cavitation-model/99863)
**Author:** [@t\_vaggos007](https://www.simscale.com/forum/u/t_vaggos007)\ **Replies:** 4\ **Last updated:** [March 12, 2025, 9:40pm UTC](https://www.simscale.com/forum/t/liquid-reference-pressure-in-the-cavitation-model/99863 "2025-03-12T21:40:55Z")
Hi ! I read on the Simscale website that the reference pressure in the cavitation model is used to calculate the density. Is this pressure the same as the inlet pressure in the pump or does it have a different meaning? I… --- ## [Computing Mesh](https://www.simscale.com/forum/t/computing-mesh/99827)
**Author:** [@esirianni](https://www.simscale.com/forum/u/esirianni)\ **Replies:** 2\ **Last updated:** [February 26, 2025, 11:15am UTC](https://www.simscale.com/forum/t/computing-mesh/99827 "2025-02-26T11:15:14Z")
When trying to compute mesh, it doesn’t seem to have made any progress, despite waiting a long time. It won’t go past this screen. Thankful for any help or advice! [Previous page](https://www.simscale.com/forum/c/using-simscale/cfd/11.md) [Next page](https://www.simscale.com/forum/c/using-simscale/cfd/11.md?page=2)