The phrase "a number of simultaneous" is correct and usable in written English.
It can be used when referring to multiple events or actions occurring at the same time.
Example: "The experiment required a number of simultaneous tests to ensure accurate results."
Alternatives: "several concurrent" or "multiple overlapping".
Baudot devised a system for multiplexing (switching) a single line among a number of simultaneous users.
In 1856 he went secretly to Genoa to plan a number of simultaneous insurrections.
"The routine... had a number of simultaneous, sexualised elements concentrated into a relatively short period of time and there was therefore a cumulative effect".
A typical modern GEO satellite, such as the Intelsat series, has more than a hundred separate microwave transponders that service a number of simultaneous users based on a time-division multiple access (TDMA) protocol.
The exact cause of each attack can be hard to pinpoint because, as during a scourge of contract murders aimed at businessmen in Russia in the 1990s, the victims often appear to be embroiled in a number of simultaneous disputes.
A number of simultaneous reactions occur in the bath studied.
I explain to myself his bewildering style thus: he is attempting the impossible with it a certain very particular form of the impossible; namely, to produce upon the reader, as a painting produces upon the gazer, a number of superimposed, simultaneous impressions.
As mentioned above, the position constraint method based on a boundary condition involves a large number of simultaneous linear equations.
The number of channels in a GPS receiver corresponds to a maximal number of simultaneous tracking GPS satellites.
EISCAT_3D is designed to provide a high-power, high-gain aperture, combining fully digital element technology with a wide receiver bandwidth over a large number of simultaneous, adaptive, and independent receiver beams.
ADaCGH can handle a large number of simultaneous users as a result of both parallelization of the computations and load balancing of the non-parallelized code.
