#boundarylayer — Public Fediverse posts

A new perspective on pipe flow instability: not small perturbations, but energy thresholds for vortex formation may trigger turbulence in Hagen–Poiseuille flow.

🔗 https://pubs.aip.org/aip/pof/article-abstract/38/3/034102/3382025/Generalization-of-Landau-s-criterion-for-Hagen?redirectedFrom=fulltext

#FluidDynamics #FlowInstability #Turbulence #BoundaryLayer #Physics

A new perspective on pipe flow instability: not small perturbations, but energy thresholds for vortex formation may trigger turbulence in Hagen–Poiseuille flow.

🔗 https://pubs.aip.org/aip/pof/article-abstract/38/3/034102/3382025/Generalization-of-Landau-s-criterion-for-Hagen?redirectedFrom=fulltext

#FluidDynamics #FlowInstability #Turbulence #BoundaryLayer #Physics

A new perspective on pipe flow instability: not small perturbations, but energy thresholds for vortex formation may trigger turbulence in Hagen–Poiseuille flow.

🔗 https://pubs.aip.org/aip/pof/article-abstract/38/3/034102/3382025/Generalization-of-Landau-s-criterion-for-Hagen?redirectedFrom=fulltext

#FluidDynamics #FlowInstability #Turbulence #BoundaryLayer #Physics

A new perspective on pipe flow instability: not small perturbations, but energy thresholds for vortex formation may trigger turbulence in Hagen–Poiseuille flow.

🔗 https://pubs.aip.org/aip/pof/article-abstract/38/3/034102/3382025/Generalization-of-Landau-s-criterion-for-Hagen?redirectedFrom=fulltext

#FluidDynamics #FlowInstability #Turbulence #BoundaryLayer #Physics

A new perspective on pipe flow instability: not small perturbations, but energy thresholds for vortex formation may trigger turbulence in Hagen–Poiseuille flow.

🔗 https://pubs.aip.org/aip/pof/article-abstract/38/3/034102/3382025/Generalization-of-Landau-s-criterion-for-Hagen?redirectedFrom=fulltext

#FluidDynamics #FlowInstability #Turbulence #BoundaryLayer #Physics

I’m interested in active boundary-layer control (DBD plasma actuators), low-speed aerodynamics, and open-source CFD workflows on Linux. Happy to exchange ideas, experiments, and practical insights.

#Aerodynamics #CFD #DBD #PlasmaActuators #BoundaryLayer
#OpenFOAM #SU2 #Linux #LowSpeedAerodynamics

#CopterPortrait Meet Flik¹, the #multicopter we developed our first #PARASITE payload for. It's a commercial dji Mavic 3E drone typically used for photography. Here, Flik is measuring for the #TeamX campaign in #Austria, which will eventually improve #mountainWeather forecasts.

🌡️ Our PARASITE system (running ❄️ #NixOS) has several ventilated meteorological sensors on board for temperature and relative humidity.

💨 From all the data we get from copter and sensors we derive a fast 3D wind measurement. So yes: We can now measure #turbulence with a copter, without the need for an actual anemometer: The copter is our anemometer!

✅ Comparisons in #Falkenberg with a @DeutscherWetterdienst tower shows that the data quality is comparable to ultrasonic anemometers - the current gold standard of operational turbulence measurements.

¹ yes, from #Pixar's #BugsLife 🐜 😉

#meteorology #boundaryLayer

#CopterPortrait Meet Flik¹, the #multicopter we developed our first #PARASITE payload for. It's a commercial dji Mavic 3E drone typically used for photography. Here, Flik is measuring for the #TeamX campaign in #Austria, which will eventually improve #mountainWeather forecasts.

🌡️ Our PARASITE system (running ❄️ #NixOS) has several ventilated meteorological sensors on board for temperature and relative humidity.

💨 From all the data we get from copter and sensors we derive a fast 3D wind measurement. So yes: We can now measure #turbulence with a copter, without the need for an actual anemometer: The copter is our anemometer!

✅ Comparisons in #Falkenberg with a @DeutscherWetterdienst tower shows that the data quality is comparable to ultrasonic anemometers - the current gold standard of operational turbulence measurements.

¹ yes, from #Pixar's #BugsLife 🐜 😉

#meteorology #boundaryLayer

#CopterPortrait Meet Flik¹, the #multicopter we developed our first #PARASITE payload for. It's a commercial dji Mavic 3E drone typically used for photography. Here, Flik is measuring for the #TeamX campaign in #Austria, which will eventually improve #mountainWeather forecasts.

🌡️ Our PARASITE system (running ❄️ #NixOS) has several ventilated meteorological sensors on board for temperature and relative humidity.

💨 From all the data we get from copter and sensors we derive a fast 3D wind measurement. So yes: We can now measure #turbulence with a copter, without the need for an actual anemometer: The copter is our anemometer!

✅ Comparisons in #Falkenberg with a @DeutscherWetterdienst tower shows that the data quality is comparable to ultrasonic anemometers - the current gold standard of operational turbulence measurements.

¹ yes, from #Pixar's #BugsLife 🐜 😉

#meteorology #boundaryLayer

#CopterPortrait Meet Flik¹, the #multicopter we developed our first #PARASITE payload for. It's a commercial dji Mavic 3E drone typically used for photography. Here, Flik is measuring for the #TeamX campaign in #Austria, which will eventually improve #mountainWeather forecasts.

🌡️ Our PARASITE system (running ❄️ #NixOS) has several ventilated meteorological sensors on board for temperature and relative humidity.

💨 From all the data we get from copter and sensors we derive a fast 3D wind measurement. So yes: We can now measure #turbulence with a copter, without the need for an actual anemometer: The copter is our anemometer!

✅ Comparisons in #Falkenberg with a @DeutscherWetterdienst tower shows that the data quality is comparable to ultrasonic anemometers - the current gold standard of operational turbulence measurements.

¹ yes, from #Pixar's #BugsLife 🐜 😉

#meteorology #boundaryLayer

#CopterPortrait Meet Flik¹, the #multicopter we developed our first #PARASITE payload for. It's a commercial dji Mavic 3E drone typically used for photography. Here, Flik is measuring for the #TeamX campaign in #Austria, which will eventually improve #mountainWeather forecasts.

🌡️ Our PARASITE system (running ❄️ #NixOS) has several ventilated meteorological sensors on board for temperature and relative humidity.

💨 From all the data we get from copter and sensors we derive a fast 3D wind measurement. So yes: We can now measure #turbulence with a copter, without the need for an actual anemometer: The copter is our anemometer!

✅ Comparisons in #Falkenberg with a @DeutscherWetterdienst tower shows that the data quality is comparable to ultrasonic anemometers - the current gold standard of operational turbulence measurements.

¹ yes, from #Pixar's #BugsLife 🐜 😉

#meteorology #boundaryLayer

"...This was the first targeted dual-polarization radar, multiple-Doppler, and micronet study of the impacts of totality on meteorology and insect behavior...Rapid and substantial changes in the boundary layer and propagation of a prominent radar fine line associated with a posttotality wind shift mechanism different than previously hypothesized were observed. Profound and rapid changes in airborne insect behavior were documented, including descent and then reascent during the minutes immediately surrounding totality, with implications related to solar-related insect navigational mechanisms and behavior."

#insects
#SolarEclipse
#meteorology
#BoundaryLayer

https://journals.ametsoc.org/view/journals/bams/106/5/BAMS-D-24-0165.1.xml

"...This was the first targeted dual-polarization radar, multiple-Doppler, and micronet study of the impacts of totality on meteorology and insect behavior...Rapid and substantial changes in the boundary layer and propagation of a prominent radar fine line associated with a posttotality wind shift mechanism different than previously hypothesized were observed. Profound and rapid changes in airborne insect behavior were documented, including descent and then reascent during the minutes immediately surrounding totality, with implications related to solar-related insect navigational mechanisms and behavior."

#insects
#SolarEclipse
#meteorology
#BoundaryLayer

https://journals.ametsoc.org/view/journals/bams/106/5/BAMS-D-24-0165.1.xml

"...This was the first targeted dual-polarization radar, multiple-Doppler, and micronet study of the impacts of totality on meteorology and insect behavior...Rapid and substantial changes in the boundary layer and propagation of a prominent radar fine line associated with a posttotality wind shift mechanism different than previously hypothesized were observed. Profound and rapid changes in airborne insect behavior were documented, including descent and then reascent during the minutes immediately surrounding totality, with implications related to solar-related insect navigational mechanisms and behavior."

#insects
#SolarEclipse
#meteorology
#BoundaryLayer

https://journals.ametsoc.org/view/journals/bams/106/5/BAMS-D-24-0165.1.xml

"...This was the first targeted dual-polarization radar, multiple-Doppler, and micronet study of the impacts of totality on meteorology and insect behavior...Rapid and substantial changes in the boundary layer and propagation of a prominent radar fine line associated with a posttotality wind shift mechanism different than previously hypothesized were observed. Profound and rapid changes in airborne insect behavior were documented, including descent and then reascent during the minutes immediately surrounding totality, with implications related to solar-related insect navigational mechanisms and behavior."

#insects
#SolarEclipse
#meteorology
#BoundaryLayer

https://journals.ametsoc.org/view/journals/bams/106/5/BAMS-D-24-0165.1.xml

"...This was the first targeted dual-polarization radar, multiple-Doppler, and micronet study of the impacts of totality on meteorology and insect behavior...Rapid and substantial changes in the boundary layer and propagation of a prominent radar fine line associated with a posttotality wind shift mechanism different than previously hypothesized were observed. Profound and rapid changes in airborne insect behavior were documented, including descent and then reascent during the minutes immediately surrounding totality, with implications related to solar-related insect navigational mechanisms and behavior."

#insects
#SolarEclipse
#meteorology
#BoundaryLayer

https://journals.ametsoc.org/view/journals/bams/106/5/BAMS-D-24-0165.1.xml

Excellent first day @PolarRES annual meeting, some highlights: masses of interesting stuff on polar - lower latitude connections; excellent process studies on #clouds, #boundarylayer processes, #seaIce + #snow.
Good intro to sister projects @CRiceS @crices.bsky.social @OceanIceEU

Excellent first day @PolarRES annual meeting, some highlights: masses of interesting stuff on polar - lower latitude connections; excellent process studies on #clouds, #boundarylayer processes, #seaIce + #snow.
Good intro to sister projects @CRiceS @crices.bsky.social @OceanIceEU

Excellent first day @PolarRES annual meeting, some highlights: masses of interesting stuff on polar - lower latitude connections; excellent process studies on #clouds, #boundarylayer processes, #seaIce + #snow.
Good intro to sister projects @CRiceS @crices.bsky.social @OceanIceEU

Excellent first day @PolarRES annual meeting, some highlights: masses of interesting stuff on polar - lower latitude connections; excellent process studies on #clouds, #boundarylayer processes, #seaIce + #snow.
Good intro to sister projects @CRiceS @crices.bsky.social @OceanIceEU

Excellent first day @PolarRES annual meeting, some highlights: masses of interesting stuff on polar - lower latitude connections; excellent process studies on #clouds, #boundarylayer processes, #seaIce + #snow.
Good intro to sister projects @CRiceS @crices.bsky.social @OceanIceEU