# Fluid Flow / CFD **URL:** https://www.simscale.com/forum/c/using-simscale/cfd/11.md [Latest](https://www.simscale.com/forum/latest.md) · [Categories](https://www.simscale.com/forum/categories.md) --- ## [A collection of CFD resources](https://www.simscale.com/forum/t/a-collection-of-cfd-resources/70650)
**Author:** [@jousefm](https://www.simscale.com/forum/u/jousefm)\ **Replies:** 0\ **Last updated:** [June 18, 2017, 10:56am UTC](https://www.simscale.com/forum/t/a-collection-of-cfd-resources/70650 "2017-06-18T10:56:29Z")
In this thread we provide you with the best resources you need in order to understand the functionalities of SimScale, set up your own simulations and learn about the theoretical fundamentals of the interesting field o… --- ## [Radiation and natural convection in a sealed double-glazed cavity: how do you set it up?](https://www.simscale.com/forum/t/radiation-and-natural-convection-in-a-sealed-double-glazed-cavity-how-do-you-set-it-up/101398)
**Author:** [@marcomaesgs1](https://www.simscale.com/forum/u/marcomaesgs1)\ **Replies:** 1\ **Last updated:** [October 23, 2026, 9:37am UTC](https://www.simscale.com/forum/t/radiation-and-natural-convection-in-a-sealed-double-glazed-cavity-how-do-you-set-it-up/101398 "2026-10-23T09:37:12Z")
Hi all, I’m modeling heat transfer through a double-glazed unit, about \[24 mm\] overall with a \[12 mm\] gas-filled cavity, to estimate center-of-glass heat flux. I’d like to capture both natural convection in the cavity a… --- ## [Incompressible CFD workflow unavailable on metric fluid-only geometry](https://www.simscale.com/forum/t/incompressible-cfd-workflow-unavailable-on-metric-fluid-only-geometry/101380)
**Author:** [@Bjkadb](https://www.simscale.com/forum/u/Bjkadb)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 1:45pm UTC](https://www.simscale.com/forum/t/incompressible-cfd-workflow-unavailable-on-metric-fluid-only-geometry/101380 "2026-10-07T13:45:01Z")
I am trying to set up a steady external-airflow case in this public SimScale project: https://www.simscale.com/projects/Bjkadb/akjbdba\_593241773/ The project uses the Boeing 777-300ER STL \`aircraft\_clean.stl\`. I created… --- ## [Issue creating simulation](https://www.simscale.com/forum/t/issue-creating-simulation/101239)
**Author:** [@rommel\_exe](https://www.simscale.com/forum/u/rommel_exe)\ **Replies:** 2\ **Last updated:** [September 24, 2026, 6:59pm UTC](https://www.simscale.com/forum/t/issue-creating-simulation/101239 "2026-09-24T18:59:37Z")
Hi guys, I am trying to run an incompressible simulation on this CAD model: SimScale Login However, each and every time I encounter a different issue. I am new to Simscale so I was wondering if someone could guide me t… --- ## [Tesla Micromixer CFD simulation troubleshooting - incorrect results and distribution](https://www.simscale.com/forum/t/tesla-micromixer-cfd-simulation-troubleshooting-incorrect-results-and-distribution/101218)
**Author:** [@Karakat](https://www.simscale.com/forum/u/Karakat)\ **Replies:** 3\ **Last updated:** [September 24, 2026, 6:45pm UTC](https://www.simscale.com/forum/t/tesla-micromixer-cfd-simulation-troubleshooting-incorrect-results-and-distribution/101218 "2026-09-24T18:45:53Z")
Hello, I am working on a Tesla Micromixer simulation using the Incompressible CFD solver. I have set up everything, but the simulation results in Run 2 look completely incorrect. The contour plots for the Passive Scala… --- ## [Innacurate CFD results after changing the angle of attack](https://www.simscale.com/forum/t/innacurate-cfd-results-after-changing-the-angle-of-attack/101328)
**Author:** [@Zhiheng1203](https://www.simscale.com/forum/u/Zhiheng1203)\ **Replies:** 1\ **Last updated:** [September 24, 2026, 6:13pm UTC](https://www.simscale.com/forum/t/innacurate-cfd-results-after-changing-the-angle-of-attack/101328 "2026-09-24T18:13:29Z")
Hello everyone, I recreated the NACA0008 profile based on a dataset from UIUC and the result has a 0.2% error with the theoretical value from Vergas et al. (photo 1), when it is under an aoa of 0 degree, and Re of 2000. … --- ## [Boundary-condition strategy for liquid-cooled LPBF copper cold plates](https://www.simscale.com/forum/t/boundary-condition-strategy-for-liquid-cooled-lpbf-copper-cold-plates/101264)
**Author:** [@6585a0bd203841](https://www.simscale.com/forum/u/6585a0bd203841)\ **Replies:** 1\ **Last updated:** [August 6, 2026, 11:26am UTC](https://www.simscale.com/forum/t/boundary-condition-strategy-for-liquid-cooled-lpbf-copper-cold-plates/101264 "2026-08-06T11:26:52Z")
I am structuring a conjugate heat-transfer model for a liquid-cooled cold plate made by laser powder bed fusion in copper alloy. The internal channels are as-built, so the measured inputs available for correlation are fl… --- ## [Can SimScale compute the natural angular velocity (RPM) of a wind turbine rotor from aerodynamic forces?](https://www.simscale.com/forum/t/can-simscale-compute-the-natural-angular-velocity-rpm-of-a-wind-turbine-rotor-from-aerodynamic-forces/101246)
**Author:** [@Deta22](https://www.simscale.com/forum/u/Deta22)\ **Replies:** 1\ **Last updated:** [August 5, 2026, 2:57pm UTC](https://www.simscale.com/forum/t/can-simscale-compute-the-natural-angular-velocity-rpm-of-a-wind-turbine-rotor-from-aerodynamic-forces/101246 "2026-08-05T14:57:47Z")
Hi SimScale Team, I am working on an academic CFD project involving an Archimedes Screw Wind Turbine (ASWT). My objective is to determine the natural rotational speed (angular velocity/RPM) of the rotor generated by th… --- ## [Best practices for resolving thin coolant gaps in conjugate heat transfer simulations of battery modules?](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101172)
**Author:** [@marcomaesgs1](https://www.simscale.com/forum/u/marcomaesgs1)\ **Replies:** 1\ **Last updated:** [July 9, 2026, 3:16pm UTC](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101172 "2026-07-09T15:16:52Z")
I’m setting up a conjugate heat transfer (CHT) simulation of a tightly packed prismatic battery module and running into the classic trade-off between mesh count and resolving the thin fluid gaps between cells and the sol… --- ## [Drag coefficient is unusually low? How to fix this?](https://www.simscale.com/forum/t/drag-coefficient-is-unusually-low-how-to-fix-this/101170)
**Author:** [@yueqian\_jiang](https://www.simscale.com/forum/u/yueqian_jiang)\ **Replies:** 3\ **Last updated:** [July 6, 2026, 2:24pm UTC](https://www.simscale.com/forum/t/drag-coefficient-is-unusually-low-how-to-fix-this/101170 "2026-07-06T14:24:51Z")
I am using CFD to optimizing the geometry of a competitive swim cap (including surface textures and patterns). As a baseline for comparison, I first performed an incompressible water flow simulation around a perfect sphe… --- ## [Compressible solver: Negative initial temperature error at low temperatures (216-223K)](https://www.simscale.com/forum/t/compressible-solver-negative-initial-temperature-error-at-low-temperatures-216-223k/101152)
**Author:** [@BraylovesF1](https://www.simscale.com/forum/u/BraylovesF1)\ **Replies:** 2\ **Last updated:** [June 26, 2026, 2:04pm UTC](https://www.simscale.com/forum/t/compressible-solver-negative-initial-temperature-error-at-low-temperatures-216-223k/101152 "2026-06-26T14:04:45Z")
Using the compressible solver at steady state with k-omega SST turbulence model. I am simulating external flow over a delta wing at high altitude conditions. I have tried setting initial conditions, subdomain, and veloc… --- ## [Hydrodynamic focussing multiphase simulation not running](https://www.simscale.com/forum/t/hydrodynamic-focussing-multiphase-simulation-not-running/101125)
**Author:** [@billflan1996](https://www.simscale.com/forum/u/billflan1996)\ **Replies:** 2\ **Last updated:** [June 26, 2026, 1:33pm UTC](https://www.simscale.com/forum/t/hydrodynamic-focussing-multiphase-simulation-not-running/101125 "2026-06-26T13:33:57Z")
Hi all, I am trying to run a a multiphase simulation to model hydrodynamic focussing of a core stream by sheath fluid in a flow cytometry cuvette geometry. I managed to get the simulation to run, but the completion perc… --- ## [Best practices for resolving thin coolant gaps in conjugate heat transfer simulations of battery modules?](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101146)
**Author:** [@marcomaesgs1](https://www.simscale.com/forum/u/marcomaesgs1)\ **Replies:** 1\ **Last updated:** [June 24, 2026, 7:37am UTC](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101146 "2026-06-24T07:37:13Z")
I’m setting up a conjugate heat transfer (CHT) simulation of a tightly packed prismatic battery module and running into the classic trade-off between mesh count and resolving the thin fluid gaps between cells and the sol… --- ## [SimScale Error When Creating External Flow Volume](https://www.simscale.com/forum/t/simscale-error-when-creating-external-flow-volume/101111)
**Author:** [@jruiz\_gim\_nez](https://www.simscale.com/forum/u/jruiz_gim_nez)\ **Replies:** 2\ **Last updated:** [June 19, 2026, 1:37pm UTC](https://www.simscale.com/forum/t/simscale-error-when-creating-external-flow-volume/101111 "2026-06-19T13:37:40Z")
Hello, good morning. I am currently working on a project to optimize the shark fin area of a race car by varying the yaw angle. After modifying the prototype and cleaning up the geometry to avoid import issues, I encoun… --- ## [seawater ciculation](https://www.simscale.com/forum/t/seawater-ciculation/101116)
**Author:** [@hioub](https://www.simscale.com/forum/u/hioub)\ **Replies:** 1\ **Last updated:** [June 19, 2026, 12:33pm UTC](https://www.simscale.com/forum/t/seawater-ciculation/101116 "2026-06-19T12:33:45Z")
Hello Team, I want to modelize the circulation of the sewater in a sterntube with 2 grooved bearings and a shaft. What is the best AI I could give prompt to create the file to be imported? Chatgpt looks weak for that. … --- ## [Fluid volume acceleration in simscale](https://www.simscale.com/forum/t/fluid-volume-acceleration-in-simscale/101108)
**Author:** [@aupe8373](https://www.simscale.com/forum/u/aupe8373)\ **Replies:** 3\ **Last updated:** [June 4, 2026, 7:04pm UTC](https://www.simscale.com/forum/t/fluid-volume-acceleration-in-simscale/101108 "2026-06-04T19:04:48Z")
I want to measure the fluid shear stresses experienced in a small enclosed volume of fluid when it experiences a sudden stop after travelling at a velocity. I am modeling this with a cylindrical volume with fluid propert… --- ## [Is this the right way?](https://www.simscale.com/forum/t/is-this-the-right-way/101059)
**Author:** [@lego2577](https://www.simscale.com/forum/u/lego2577)\ **Replies:** 1\ **Last updated:** [May 29, 2026, 7:30pm UTC](https://www.simscale.com/forum/t/is-this-the-right-way/101059 "2026-05-29T19:30:46Z")
Hi everyone, I am a student using SimScale for the first time to analyze fluid flow and fan performance inside a high-density electronics housing, which is structured similarly to a large computer chassis or a blade ser… --- ## [External CFD Runs Failing on the standard test model](https://www.simscale.com/forum/t/external-cfd-runs-failing-on-the-standard-test-model/101100)
**Author:** [@cwinder](https://www.simscale.com/forum/u/cwinder)\ **Replies:** 1\ **Last updated:** [May 29, 2026, 4:37pm UTC](https://www.simscale.com/forum/t/external-cfd-runs-failing-on-the-standard-test-model/101100 "2026-05-29T16:37:34Z")
After having troubles using public .step files for a CFD, I decided I would use the basic test one that comes with simscale. I made it farther with this one, as I was able to make a mesh. But both test runs failed saying… --- ## [Closed Loop Conjugate Heat Transfer Simulation — How to Set Up Forced Flow Without Inlet/Outlet](https://www.simscale.com/forum/t/closed-loop-conjugate-heat-transfer-simulation-how-to-set-up-forced-flow-without-inlet-outlet/101091)
**Author:** [@jarueky](https://www.simscale.com/forum/u/jarueky)\ **Replies:** 1\ **Last updated:** [May 25, 2026, 8:24pm UTC](https://www.simscale.com/forum/t/closed-loop-conjugate-heat-transfer-simulation-how-to-set-up-forced-flow-without-inlet-outlet/101091 "2026-05-25T20:24:31Z")
Hi SimScale community, I’m a student working on a project called Project ARCTIS — a simplified magnetocaloric refrigeration system using a Halbach array and a Gadolinium (Gd) magnetocaloric bed. I’m trying to run a Conj… --- ## [Which solvers can I use for supersonic flow? Can I use the Subsonic solver?](https://www.simscale.com/forum/t/which-solvers-can-i-use-for-supersonic-flow-can-i-use-the-subsonic-solver/96392)
**Author:** [@ataleb](https://www.simscale.com/forum/u/ataleb)\ **Replies:** 1\ **Last updated:** [May 22, 2026, 10:07am UTC](https://www.simscale.com/forum/t/which-solvers-can-i-use-for-supersonic-flow-can-i-use-the-subsonic-solver/96392 "2026-05-22T10:07:26Z")
The best module for simulating supersonic flow is the Subsonic module, although the name of the solver implies the opposite. The name Subsonic was chosen when the new solver was initially released. At the time, supersoni… --- ## [Μesh generation problem due to rotational zone](https://www.simscale.com/forum/t/esh-generation-problem-due-to-rotational-zone/101029)
**Author:** [@evangtsichlas](https://www.simscale.com/forum/u/evangtsichlas)\ **Replies:** 9\ **Last updated:** [May 19, 2026, 2:32pm UTC](https://www.simscale.com/forum/t/esh-generation-problem-due-to-rotational-zone/101029 "2026-05-19T14:32:34Z")
I am facing an issue: I cannot generate the mesh because of the error message shown in the image. I understand that this issue can occur with the Multi-purpose Dens solver, but I selected the Incompressible solver since … --- ## [How to check the flow rate of a rotating zone?](https://www.simscale.com/forum/t/how-to-check-the-flow-rate-of-a-rotating-zone/101003)
**Author:** [@prusso630](https://www.simscale.com/forum/u/prusso630)\ **Replies:** 3\ **Last updated:** [April 27, 2026, 9:46am UTC](https://www.simscale.com/forum/t/how-to-check-the-flow-rate-of-a-rotating-zone/101003 "2026-04-27T09:46:56Z")
TurbineStudy001 | SimScale Workbench I set up this tutorial example with the geometry of turbine blades based from golden spirals and the most basic cylindrical nose cone with an outer hull. How to set up the turbine bl… --- ## [Sreamling analysis](https://www.simscale.com/forum/t/sreamling-analysis/101002)
**Author:** [@constantin07](https://www.simscale.com/forum/u/constantin07)\ **Replies:** 1\ **Last updated:** [April 27, 2026, 9:30am UTC](https://www.simscale.com/forum/t/sreamling-analysis/101002 "2026-04-27T09:30:45Z")
I need help!! How i have to set it so I can see how my Wind Turbine Rotor in Wind. --- ## [Topological Entity Error in Incompressible CFD Simulation (BCC Lattice)](https://www.simscale.com/forum/t/topological-entity-error-in-incompressible-cfd-simulation-bcc-lattice/100960)
**Author:** [@shekokarmahesh](https://www.simscale.com/forum/u/shekokarmahesh)\ **Replies:** 1\ **Last updated:** [April 14, 2026, 4:44pm UTC](https://www.simscale.com/forum/t/topological-entity-error-in-incompressible-cfd-simulation-bcc-lattice/100960 "2026-04-14T16:44:05Z")
Hi SimScale Team, I am trying to perform an incompressible CFD simulation of water flow through a BCC lattice structure. Project URL: https://www.simscale.com/workbench/?pid=3754054932019217564&mi=spec:3cf238b3-39dc-4… --- ## [Exporting 1.7m Pedestrian Velocity Data from Incompressible to GIS](https://www.simscale.com/forum/t/exporting-1-7m-pedestrian-velocity-data-from-incompressible-to-gis/100884)
**Author:** [@akriger](https://www.simscale.com/forum/u/akriger)\ **Replies:** 7\ **Last updated:** [March 29, 2026, 11:59am UTC](https://www.simscale.com/forum/t/exporting-1-7m-pedestrian-velocity-data-from-incompressible-to-gis/100884 "2026-03-29T11:59:10Z")
I am conducting an urban microclimate study on the SAAO site in Cape Town using the Incompressible (OpenFOAM) solver. Since the automated “Pedestrian Wind Comfort” (LBM) suite is not available for this analysis type, I … --- ## [External flow sim for miniature car](https://www.simscale.com/forum/t/external-flow-sim-for-miniature-car/100869)
**Author:** [@tarayssi](https://www.simscale.com/forum/u/tarayssi)\ **Replies:** 1\ **Last updated:** [March 22, 2026, 3:27pm UTC](https://www.simscale.com/forum/t/external-flow-sim-for-miniature-car/100869 "2026-03-22T15:27:24Z")
I am trying to simulate the evolution of airflow around a miniature (20 cm) model car when it accelerates from 0 to around 60 kph, to look at how efficient the car’s aero is during acceleration. Any help is much appreci… --- ## [CFD at Mach 0.85](https://www.simscale.com/forum/t/cfd-at-mach-0-85/100863)
**Author:** [@nyuadspace](https://www.simscale.com/forum/u/nyuadspace)\ **Replies:** 1\ **Last updated:** [March 18, 2026, 10:12am UTC](https://www.simscale.com/forum/t/cfd-at-mach-0-85/100863 "2026-03-18T10:12:32Z")
Hello, I am currently trying to determine the drag coefficient (Cd) of our rocket booster at Max Q, which occurs at approximately 290 m/s. To do this, I followed the Compressible Flow simulation tutorial provided by Sim… --- ## [CHT Electronic speed controller](https://www.simscale.com/forum/t/cht-electronic-speed-controller/100862)
**Author:** [@akarshshtt8](https://www.simscale.com/forum/u/akarshshtt8)\ **Replies:** 1\ **Last updated:** [March 16, 2026, 9:31am UTC](https://www.simscale.com/forum/t/cht-electronic-speed-controller/100862 "2026-03-16T09:31:56Z")
Hello I was trying to simulate a natural convection process in Ansys FLUENT of an esc placed within a fuselage simulating the conditions experienced by it during its climb phase. The esc is placed 5mm above the fuselage… --- ## [How to down load the mesh](https://www.simscale.com/forum/t/how-to-down-load-the-mesh/100807)
**Author:** [@molen\_victor](https://www.simscale.com/forum/u/molen_victor)\ **Replies:** 2\ **Last updated:** [March 9, 2026, 10:27pm UTC](https://www.simscale.com/forum/t/how-to-down-load-the-mesh/100807 "2026-03-09T22:27:52Z")
I have a succsful run and I can download the run data (using Solution Fields → Download Results). But I have the idea this does not include the mesh conditions. I am missing for instance the file: system/snappyHexMeshDic… --- ## [Incompressible fluid simulation error message](https://www.simscale.com/forum/t/incompressible-fluid-simulation-error-message/100614)
**Author:** [@Jamessquire](https://www.simscale.com/forum/u/Jamessquire)\ **Replies:** 1\ **Last updated:** [February 26, 2026, 10:39pm UTC](https://www.simscale.com/forum/t/incompressible-fluid-simulation-error-message/100614 "2026-02-26T22:39:58Z")
Hello, I have recently been trying to fluid sim an injector part and it worked the first few times however it is now giving me an error message after the simulation has run and I try to access the ‘post-process results’ … [Next page](https://www.simscale.com/forum/c/using-simscale/cfd/11.md?page=1)